| Title | Pages | Publication | Code | Date | Publisher | System (Setting) |
|---|
 1920s Sourcebook | 122-126 |  Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
 6-8 Player Dreamlands Map | | 6-8 Player Dreamlands Map | CW-M07 | 2017 | Petersen Games | Cthulhu Wars | |
| 6-8 Player Earth Map | | 6-8 Player Earth Map | CW-M04 | 2015 | Petersen Games | Cthulhu Wars | |
| 6-8 Player Library at Celaeno Map | | 6-8 Player Library at Celaeno Map | CW-M09 | 2017 | Petersen Games | Cthulhu Wars | |
| 6-8 Player Map Pack | | 6-8 Player Map Pack | CW-M10 | 2017 | Petersen Games | Cthulhu Wars | |
| 6-8 Player Primeval Map | | 6-8 Player Primeval Map | CW-M06 | 2017 | Petersen Games | Cthulhu Wars | |
| 6-8 Player Shaggai Map | | 6-8 Player Shaggai Map | CW-M12 | 2019 | Petersen Games | Cthulhu Wars | |
| 6-8 Player Yuggoth Map | | 6-8 Player Yuggoth Map | CW-M08 | 2017 | Petersen Games | Cthulhu Wars | |
| 8-Bit Attack | | 8-Bit Attack | | 2019 | Petersen Games | 8-Bit Attack | |
| 9-11 Player Earth Map | | 9-11 Player Earth Map | CW-M14A | 2023 | Petersen Games | Cthulhu Wars | |
| 9-11 Player neoprene Map | | 9-11 Player neoprene Map | CW-M911 | | Petersen Games | Cthulhu Wars | |
 About Investigators | 36-47 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| About Investigators | 35-50 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| About Investigators | 18-27 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
 The Acolyte | 20-21 |  Dagon | 11 | Jan 1986 | Self Published | None | |
| The Acolyte | | Dagon | 12 | Apr 1986 | Self Published | None | |
| Additional Deities, Races and Monsters for the Cthulhu Mythos | 20-26 | Cthulhu Companion | CHA2304 | 1983 | Chaosium | Call of Cthulhu (Classic) | |
 Against the Serpentfolk | |  Against the Serpentfolk | | 2021 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Alcheringa | 34-40 | Terror Australis | CHA2319 | 1987 | Chaosium | Call of Cthulhu (Classic) | |
| Alien Technology | 156-159 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Alien Technology | 176-180 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
 Alternate Faction Acolytes | | Alternate Faction Acolytes | CW-U12 | 2019 | Petersen Games | Cthulhu Wars | |
| Amidst the Ancient Trees | 346-363 |  Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | Vermont; 1925; Summer; Glaaki |
| The Ancient Ages Again | | The Ancient Ages Again | | 2021 | Petersen Games | Dungeons and Dragons | Fantasy World; Yig; Elder Thing; Serpentman; Great Race of Yith |
| Ancients | | Ancients | CW-F6 | 2018 | Petersen Games | Cthulhu Wars | |
| Apocalypse | | Apocalypse | 8-BIT-ATTACK-3 | 2020 | Petersen Games | 8-Bit Attack | |
| Arkham Horror | | Arkham Horror | CHA1050 | 1987 | Chaosium | Arkham Horror | |
| Artifact Pack | | Artifact Pack | | 2019 | Petersen Games | Evil High Priest | |
| Artifacts and Alien Devices | 268-275 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Artifacts and Alien Devices | 268-275 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| Asenath Waite Marker | | Asenath Waite Marker | CW-E02 | 2015 | Petersen Games | Cthulhu Wars | |
| Astral Acolyte | | Astral Acolyte | | 2017 | Petersen Games | Cthulhu Wars | |
| The Atmosphere of Dreams | 17-20 | H.P. Lovecraft's Dreamlands | CHA2394 | 2004 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Automobile Chases | 164-165 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Azathoth | | Azathoth | CW-F4 | 2014 | Petersen Games | Cthulhu Wars | |
| Battle Dice | | Battle Dice | CW-U14 | 2018 | Petersen Games | Cthulhu Wars | |
| Beasts and Monsters | B:26-30 |  Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | |
| Beasts and Monsters | 117-121 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| Beasts and Monsters | 178-186 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Beasts and Monsters | 202-211 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| Beasts and Monsters | C:26-30 | Call of Cthulhu | CHA2009-X | 1981 | Chaosium | Call of Cthulhu (Classic) | |
| Beasts and Monsters | 128-137 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| Beasts, Monsters | 127-133 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| A Beginning Scenario for a Campaign | A:90-92 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | Vermont; 1920s |
| A Beginning Scenario for a Campaign | 184-186 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | Vermont; 1920s |
| Beyond Time and Space | | Beyond Time and Space | CW-U11 | 2019 | Petersen Games | Cthulhu Wars | |
| Biographies | 99-101 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| Biographies | 152-154 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Blood Ceremony | | Blood Ceremony | | 2018 | Petersen Games | Evil High Priest | |
| The Brockford House | A:85-89 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | Maine; Deep One |
| The Brockford House | 88-92 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | Maine; Deep One |
| The Brockford House | B:78-82 | Call of Cthulhu | CHA2009-X | 1981 | Chaosium | Call of Cthulhu (Classic) | Maine; Deep One |
| The Brockford House | 95-99 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Brown Jenkin | | Brown Jenkin | PGCW-U29 | 2019 | Petersen Games | Cthulhu Wars | |
| Bubastis | | Bubastis | | Jun 2020 | Petersen Games | Cthulhu Wars | |
| Cacodemon | | Cacodemon | PGCW-U30 | 2019 | Petersen Games | Cthulhu Wars | |
 The Call of Cthulhu | 8-23 | Call of Cthulhu | CHA2009-H | 2006 | Chaosium | Call of Cthulhu (Classic) | |
| Call of Cthulhu Designers' Notes | 8-13 |  Different Worlds | 19 | Feb 1982 | Chaosium | Call of Cthulhu (Classic) | |
| Call of Cthulhu Errata and Second Thoughts | 23 | Different Worlds | 19 | Feb 1982 | Chaosium | Call of Cthulhu (Classic) | |
| Call of Cthulhu Questions Answered | 3-4 | Fragments of Fear | CHA2310 | 1985 | Chaosium | Call of Cthulhu (Classic) | |
| Captives of Two Worlds | 159-168 | H.P. Lovecraft's Dreamlands | CHA2394 | 2004 | Chaosium | Call of Cthulhu (Dreamlands) | Vermont; Dreamlands |
| Captives of Two Worlds | 46-54 | H.P. Lovecraft's Dreamlands | CHA3302 | 1988 | Chaosium | Call of Cthulhu (Dreamlands) | Vermont; Dreamlands |
| Captives of Two Worlds | B:7-16 | H.P. Lovecraft's Dreamlands | CHA2315-X | 1986 | Chaosium | Call of Cthulhu (Dreamlands) | Dreamlands; Vermont |
| Captives of Two Worlds | 46-54 | H.P. Lovecraft's Dreamlands | CHA3308 | 1992 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Character Options | 52-87 | Sandy Petersen's Cthulhu Mythos | | 2016 | Petersen Games | Pathfinder | |
| Chases | 132-150 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Chases | 132-150 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| Clean Up Crew | 1-34 | Clean Up Crew | | 2019 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Colour Out of Space Gate Pack | | Colour Out of Space Gate Pack | CW-U07 | 2016 | Petersen Games | Cthulhu Wars | |
| Combat | 102-129 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Combat | B:18-20 | Call of Cthulhu Starter Set | CHA23158-X | 2018 | Chaosium | Call of Cthulhu (Classic) | |
| Combat | 102-129 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| Contemporary Investigators | 7-11 | Cthulhu Now | CHA2322 | 1987 | Chaosium | Call of Cthulhu (Now) | |
| Contemporary Investigators | 7-11 | Cthulhu Now | CHA3307 | 1992 | Chaosium | Call of Cthulhu (Now) | |
| Cosmic Terrors Pack | | Cosmic Terrors Pack | CW-U05 | 2017 | Petersen Games | Cthulhu Wars | |
| Costs, Equiment and Services | 254-259 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Costs, Equiment and Services | 288-293 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| Creating an Investigator | B:6-13 | Call of Cthulhu Starter Set | CHA23158-X | 2018 | Chaosium | Call of Cthulhu (Classic) | |
| Creating Investigators | 30-51 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Creating Investigators | 30-51 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| Creating the Investigator | A:9-13 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | |
| Creating the Investigator | 11-15 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| Creating the Investigator | B:6-11 | Call of Cthulhu | CHA2009-X | 1981 | Chaosium | Call of Cthulhu (Classic) | |
| Creatures from the Dreamtime | 41-51 | Terror Australis | CHA2319 | 1987 | Chaosium | Call of Cthulhu (Classic) | |
| The Creatures of the Dreamlands | 66-123 | S. Petersen's Field Guide to Lovcraftian Horrors | CHA23138 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Creatures of the Mythos | 132-155 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Creatures of the Mythos | 148-175 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| Creatures of the Mythos | 86-127 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| Crimson Letters | 364-383 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | Arkham; October; 1920s |
| A Cthulhu Grimoire | 8-17 | Fragments of Fear | CHA2310 | 1985 | Chaosium | Call of Cthulhu (Classic) | |
| The Cthulhu Mythos | A:32-62 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | |
| The Cthulhu Mythos | 37-66 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| The Cthulhu Mythos | 96-100 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| The Cthulhu Mythos | 106-111 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| The Cthulhu Mythos | B:28-57 | Call of Cthulhu | CHA2009-X | 1981 | Chaosium | Call of Cthulhu (Classic) | |
| The Cthulhu Mythos | 65-68 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| Cthulhu Mythos | 37-75 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Cthulhu Wars | | Cthulhu Wars | PETCTHU01 | 2015 | Petersen Games | Cthulhu Wars | |
| Cthulhu Wars Duel | | Cthulhu Wars Duel | | 2020 | Petersen Games | Cthulhu Wars | |
| Cthulhu: The Harbinger | | Cthulhu: The Harbinger | | 2020 | Petersen Games | Cthulhu Wars | |
| Cultic Set 1 | | Cultic Set 1 | | 2019 | Petersen Games | Evil High Priest | |
| Cultic Set 2 | | Cultic Set 2 | | 2019 | Petersen Games | Evil High Priest | |
| Cultic Set 3 | | Cultic Set 3 | | 2019 | Petersen Games | Evil High Priest | |
| Cults | 170-201 | Sandy Petersen's Cthulhu Mythos | | 2016 | Petersen Games | Pathfinder | |
| Cults of the Mythos | 139-160 | Sandy Petersen's Cthulhu Mythos | | 2019 | Petersen Games | Dungeons and Dragons | |
| Custom Dice | | Custom Dice | CW-E03 | 2013 | Petersen Games | Cthulhu Wars | |
| Daemon Sultan | | Daemon Sultan | CW-F7 | 2020 | Petersen Games | Cthulhu Wars | |
| The Dark Ritual | | The Dark Ritual | | 2018 | Petersen Games | Evil High Priest | |
| Dead Man Stomp | 270-279 | Call of Cthulhu | CHA2396 | 2004 | Chaosium | Call of Cthulhu (Classic) | |
| Dead Man Stomp | 270-279 | Call of Cthulhu | CHA23126 | 2011 | Chaosium | Call of Cthulhu (Classic) | |
| Dead Man Stomp | 270-279 | Call of Cthulhu | CHA2009-H | 2006 | Chaosium | Call of Cthulhu (Classic) | |
| Death Scenes: Aftermaths of Cthulhoid Kills | 14-15 | Different Worlds | 35 | Jul 1984 | Chaosium | Call of Cthulhu (Classic) | |
| Deities of the Mythos | 160-177 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Deities of the Mythos | 181-201 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| The Derelict | 5-22 | The Derelict | CHA23150 | 2016 | Chaosium | Call of Cthulhu (Classic) | Atlantic Ocean |
| The Derelict | 41-68 | Petersen's Abominations | CHA23152 | 2017 | Chaosium | Call of Cthulhu (Now) | Atlantic Ocean |
| Dice Bag and Cup | | Dice Bag and Cup | | 2017 | Petersen Games | Cthulhu Wars | |
| Dire Azathoth | | Dire Azathoth | CW-U27 | 2019 | Petersen Games | Cthulhu Wars | |
| Dire Cthulhu | | Dire Cthulhu | CW-U13 | 2019 | Petersen Games | Cthulhu Wars | |
| Doom and Ritual Tracks | | Doom and Ritual Tracks | CW-E17 | 2019 | Petersen Games | Cthulhu Wars | |
| The Doomed World | | The Doomed World | | 2021 | Petersen Games | Dungeons and Dragons | Fantasy World |
| The Dragon Project: Mr Josh Wellmeat | 41-42, 44, 46 | Dragon | 198 | Oct 1993 | TSR | Call of Cthulhu (Classic) | 1920s |
| The Dream-Quest of Randolph Carter | 21-45 | H.P. Lovecraft's Dreamlands | CHA2394 | 2004 | Chaosium | Call of Cthulhu (Dreamlands) | |
| The Dreamlands Bestiary | 92-132 | H.P. Lovecraft's Dreamlands | CHA2394 | 2004 | Chaosium | Call of Cthulhu (Dreamlands) | |
| The Dreamlands Grimoire | 147-155 | H.P. Lovecraft's Dreamlands | CHA2394 | 2004 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Dreamlands Map | | Dreamlands Map | CW-M02 | 2015 | Petersen Games | Cthulhu Wars | |
| The Dreamlands Surface Monster Pack | | The Dreamlands Surface Monster Pack | CW-U01 | 2015 | Petersen Games | Cthulhu Wars | |
| The Dreamlands Underworld Monster Pack | | The Dreamlands Underworld Monster Pack | CW-U02 | 2015 | Petersen Games | Cthulhu Wars | |
| The Dunwich Horror | | The Dunwich Horror | | 2023 | Petersen Games | Cthulhu Wars | |
| Edge of Darkness | 256-264 | Call of Cthulhu | CHA2396 | 2004 | Chaosium | Call of Cthulhu (Classic) | |
| Edge of Darkness | 256-264 | Call of Cthulhu | CHA23126 | 2011 | Chaosium | Call of Cthulhu (Classic) | |
| Edge of Darkness | 256-264 | Call of Cthulhu | CHA2009-H | 2006 | Chaosium | Call of Cthulhu (Classic) | |
| The Eidolon | | The Eidolon | | 2019 | Petersen Games | Cthulhu Wars | |
| Elder Shoggoth | | Elder Shoggoth | | 2020 | Petersen Games | Cthulhu Wars | |
| Encore | 1-64 | Encore | | 2021 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Entering the Dreamlands | 4-8 | H.P. Lovecraft's Dreamlands | CHA3302 | 1988 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Entering the Dreamlands | A:4-8 | H.P. Lovecraft's Dreamlands | CHA2315-X | 1986 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Entering the Dreamlands | 4-8 | H.P. Lovecraft's Dreamlands | CHA3308 | 1992 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Evil High Priest | | Evil High Priest | | 2018 | Petersen Games | Evil High Priest | |
| Example of Play | 80-81 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Example of Play | 87-88 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| An Example of Play | 53-54 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| Excerpts and Prayers | 145-147 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| Expanded Mythos Bestiary | 412-497 | Sandy Petersen's Cthulhu Mythos | | 2016 | Petersen Games | Pathfinder | |
| Extinction | | Extinction | | 2021 | Petersen Games | Cthulhu Wars (Duel) | |
| Family Reunion | | Family Reunion | | 2022 | Petersen Games | Cthulhu Wars (Duel) | |
| The Fate of the Empire | | The Fate of the Empire | | 2021 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Firearms | 15-24 | Cthulhu Now | CHA2322 | 1987 | Chaosium | Call of Cthulhu (Now) | |
| Firearms | 11-29 | The 1990s Handbook | CHA2355 | 1995 | Chaosium | Call of Cthulhu (Classic) | |
| Firearms | 15-24 | Cthulhu Now | CHA3307 | 1992 | Chaosium | Call of Cthulhu (Now) | |
| The Five Basic Techniques of Starting a Cthulhu Scenario | 25 | Dagon | 20 | Nov 1987 | Self Published | Call of Cthulhu (Classic) | |
| The Game Rules | 7-10 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Game System | 82-99 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Game System | 10-18 | Call of Cthulhu 7th Edition Quick Start | CHA23131 | 2013 | Chaosium | Call of Cthulhu (Classic) | |
| Game System | B:14-15 | Call of Cthulhu Starter Set | CHA23158-X | 2018 | Chaosium | Call of Cthulhu (Classic) | |
| Game System | 82-99 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| Game System | 17-29 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Game System | 24-105 | Call of Cthulhu | CHA2396 | 2004 | Chaosium | Call of Cthulhu (Classic) | |
| Game System | 24-105 | Call of Cthulhu | CHA23126 | 2011 | Chaosium | Call of Cthulhu (Classic) | |
| Game System | 24-105 | Call of Cthulhu | CHA2009-H | 2006 | Chaosium | Call of Cthulhu (Classic) | |
| Game System and Rules | A:14-25 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | |
| Game System and Skills | 16-27 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| Game System and Skills | 28-45 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| Gate Pack | | Gate Pack | | 2013 | Petersen Games | Cthulhu Wars | |
| Gazetteer of the Dreamlands | 46-80 | H.P. Lovecraft's Dreamlands | CHA2394 | 2004 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Getting Started | 1-7 | Sandy Petersen's Cthulhu Mythos | | 2016 | Petersen Games | Pathfinder | |
| Ghatanothoa Awakens | 1-34 | Ghatanothoa Awakens | | 2019 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Ghoulocracy | 1-30 | Ghoulocracy | | 2019 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Giant Blind Albino Penguins | | Giant Blind Albino Penguins | | 2020 | Petersen Games | Cthulhu Wars | |
| Glow-in-the-Dark Cthulhu | | Glow-in-the-Dark Cthulhu | CW-GL01 | 2017 | Petersen Games | Cthulhu Wars | |
| Glow-in-the-Dark Great Old Ones | | Glow-in-the-Dark Great Old Ones | CW-GL02 | 2016 | Petersen Games | Cthulhu Wars | |
| Gods of the Dreamlands | 133-146 | H.P. Lovecraft's Dreamlands | CHA2394 | 2004 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Good Cthulhu Hunting | 8-11 | The Keeper's Companion Vol 1 | CHA2388 | 2000 | Chaosium | Call of Cthulhu (Classic) | |
| Great Old One Pack Four | | Great Old One Pack Four | CW-GOO4 | 2017 | Petersen Games | Cthulhu Wars | |
| Great Old One Pack One | | Great Old One Pack One | CW-GOO1 | 2015 | Petersen Games | Cthulhu Wars | |
| Great Old One Pack Three | | Great Old One Pack Three | CW-GOO3 | 2015 | Petersen Games | Cthulhu Wars | |
| Great Old One Pack Two | | Great Old One Pack Two | CW-GOO2 | 2015 | Petersen Games | Cthulhu Wars | |
| Great Old Ones and Outer Gods | 202-291 | Sandy Petersen's Cthulhu Mythos | | 2016 | Petersen Games | Pathfinder | |
| Great Old Ones, Outer Gods, and Others | 161-276 | Sandy Petersen's Cthulhu Mythos | | 2019 | Petersen Games | Dungeons and Dragons | |
| The Greater Grimoire | 143-158 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| The Green Pyramid | 1-38 | The Green Pyramid | | 2020 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Grimoire | 242-264 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Grimoire | 242-264 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| A Guide to Lovecraft Country | 246-249 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| A Guide to Lovecraft Country | 280-283 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| Guns in Call of Cthulhu | 16-17 | Dagon | 15 | Nov 1986 | Self Published | Call of Cthulhu (Classic) | |
| H. P. Lovecraft Bust Marker | | H. P. Lovecraft Bust Marker | CW-U06 | 2016 | Petersen Games | Cthulhu Wars | |
| H. P. Lovecraft Creations | 22-25 | The Gateway Bestiary | | 1980 | Chaosium | Runequest | |
| H. P. Lovecraft Marker | | H. P. Lovecraft Marker | CW-E01 | 2013 | Petersen Games | Cthulhu Wars | |
| Happy Halloween | | Happy Halloween | 8-BIT-ATTACK-5 | 2020 | Petersen Games | 8-Bit Attack | |
| The Haunted House | A:81-83 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | Boston; 1920 |
| The Haunted House | 84-86 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | Boston; 1920 |
| The Haunted House | B:74-76 | Call of Cthulhu | CHA2009-X | 1981 | Chaosium | Call of Cthulhu (Classic) | Boston; 1920 |
| The Haunted House | 91-93 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| The Haunting | 220-225 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | Boston; 1920 |
| The Haunting | 250-255 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | Boston; 1920 |
| The Haunting | 169-174 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | Boston; 1920 |
| The Haunting | 18-31 | Call of Cthulhu 7th Edition Quick Start | CHA23131 | 2013 | Chaosium | Call of Cthulhu (Classic) | Boston; 1920 |
| The Haunting | 250-255 | Call of Cthulhu | CHA2396 | 2004 | Chaosium | Call of Cthulhu (Classic) | |
| The Haunting | 250-255 | Call of Cthulhu | CHA23126 | 2011 | Chaosium | Call of Cthulhu (Classic) | |
| The Haunting | 250-255 | Call of Cthulhu | CHA2009-H | 2006 | Chaosium | Call of Cthulhu (Classic) | |
| The Haunting, a Retelling | 34-38 | Call of Cthulhu 7th Edition Quick Start | CHA23131 | 2013 | Chaosium | Call of Cthulhu (Classic) | |
| High Priest Expansion Pack | | High Priest Expansion Pack | CW-U03 | 2015 | Petersen Games | Cthulhu Wars | |
| Historic Timelines | 204-213 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| Hit Locations | 33-38 | Cthulhu Now | CHA2322 | 1987 | Chaosium | Call of Cthulhu (Now) | |
| Hit Locations | 53-57 | The 1990s Handbook | CHA2355 | 1995 | Chaosium | Call of Cthulhu (Classic) | |
| Hit Locations | 33-38 | Cthulhu Now | CHA3307 | 1992 | Chaosium | Call of Cthulhu (Now) | |
| Hit Points, Wounds, and Healing | B:20-21 | Call of Cthulhu Starter Set | CHA23158-X | 2018 | Chaosium | Call of Cthulhu (Classic) | |
| Homebrew Faction | | Homebrew Faction | CW-U08 | 2017 | Petersen Games | Cthulhu Wars | |
| Hotel Hell | 7-40 | Petersen's Abominations | CHA23152 | 2017 | Chaosium | Call of Cthulhu (Now) | Canada |
| Hound of Tindalos | | Hound of Tindalos | | 2016 | Petersen Games | Cthulhu Wars | |
| How to Play the Game | A:75-80 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | |
| How to Play the Game | 80-83 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| How to Play the Game | B:70-73 | Call of Cthulhu | CHA2009-X | 1981 | Chaosium | Call of Cthulhu (Classic) | |
| Howard Phillips Lovecraft | 22-27 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Howard Phillips Lovecraft | 22-27 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| Hyperspeed | | Hyperspeed | 8-BIT-ATTACK-4 | 2020 | Petersen Games | 8-Bit Attack | |
| Insanity and Dread | 70-84 | Sandy Petersen's Cthulhu Mythos | | 2019 | Petersen Games | Dungeons and Dragons | |
| Insanity and Dreams | 88-105 | Sandy Petersen's Cthulhu Mythos | | 2016 | Petersen Games | Pathfinder | |
| Introduction | 23-35 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Introduction | 24-34 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| Introduction | 12-19 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Introduction | 4 | Call of Cthulhu 7th Edition Quick Start | CHA23131 | 2013 | Chaosium | Call of Cthulhu (Classic) | |
| Introduction | 12-19 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| The Invasion | | The Invasion | | 2021 | Petersen Games | Cthulhu Wars | |
| Investigator Creation | 11-16 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Investigators | | Investigators | | 2019 | Petersen Games | Cthulhu Wars | |
| The Jitters | 1-56 | The Jitters | | 2021 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Keeper's Lore | 118-131 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Keeper's Lore | 133-147 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| Keeper's Lore | 71-84 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| A Land Out Of Time | | A Land Out Of Time | | 2021 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Libraries and Their Use | A:92-93 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | |
| Libraries and Their Use | 186-187 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| Library at Celaeno Map | | Library at Celaeno Map | CW-M05 | 2017 | Petersen Games | Cthulhu Wars | |
| Lions and Tigers and Bears, etc. | 18-19 | Fragments of Fear | CHA2310 | 1985 | Chaosium | Call of Cthulhu (Classic) | |
| Look to the Future | 13-17 | Cthulhu Classics | CHA3301 | 1989 | Chaosium | Call of Cthulhu (Classic) | New York; 1924 |
| Look to the Future | 28-39 | Shadows of Yog-Sothoth | CHA2397 | 2004 | Chaosium | Call of Cthulhu (Classic) | New York; 1924 |
| Look to the Future | 13-17 | Shadows of Yog-Sothoth | CHA2010 | 1982 | Chaosium | Call of Cthulhu (Classic) | New York; 1924 |
| Lord Great Cthulhu | | Lord Great Cthulhu | | 2020 | Petersen Games | Planet Apocalypse | |
| Lovecraftian Timeline | 14 | Cthulhu Companion | CHA2304 | 1983 | Chaosium | Call of Cthulhu (Classic) | |
| Lullaby | | Lullaby | | 2021 | Petersen Games | Dungeons and Dragons | Fantasy World |
| The Madman | A:84-85 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | Vermont; Mi-Go |
| The Madman | 87-88 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | Vermont; Mi-Go |
| The Madman | 233-236 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | Vermont; Mi-Go |
| The Madman | 265-269 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | Vermont; Mi-Go |
| The Madman | B:77-78 | Call of Cthulhu | CHA2009-X | 1981 | Chaosium | Call of Cthulhu (Classic) | Vermont; Mi-Go |
| The Madman | 174-177 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | Vermont; Mi-Go |
| The Madman | 94 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| The Madman | 265-269 | Call of Cthulhu | CHA2396 | 2004 | Chaosium | Call of Cthulhu (Classic) | |
| The Madman | 265-269 | Call of Cthulhu | CHA23126 | 2011 | Chaosium | Call of Cthulhu (Classic) | |
| The Madman | 265-269 | Call of Cthulhu | CHA2009-H | 2006 | Chaosium | Call of Cthulhu (Classic) | |
| Magic | 82-94 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Magic | 89-104 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| Magic | 172-181 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Magic | 56-64 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| Magic | 106-141 | Sandy Petersen's Cthulhu Mythos | | 2016 | Petersen Games | Pathfinder | |
| Magic | 172-181 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| Magic and Spells | A:63-74 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | |
| Magic and Spells | 67-79 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| Magic and Spells | B:59-69 | Call of Cthulhu | CHA2009-X | 1981 | Chaosium | Call of Cthulhu (Classic) | |
| Magic and Spells | 76-87 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Masks of Nyarlathotep | | Masks of Nyarlathotep | CW-U10 | 2019 | Petersen Games | Cthulhu Wars | |
| Mental Disorders | 114-117 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Mental Disorders | 128-132 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| Miskatonic U. Graduate Kit | | Miskatonic U. Graduate Kit | CHA5101 | 1987 | Chaosium | Call of Cthulhu (Classic) | |
| Mohole | 107-148 | Petersen's Abominations | CHA23152 | 2017 | Chaosium | Call of Cthulhu (Now) | North Sea |
| The Monsters of the Mythos | 7-65 | S. Petersen's Field Guide to Lovcraftian Horrors | CHA23138 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Monsters, Beasts and Alien Gods | 278-342 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Monsters, Beasts and Alien Gods | 278-342 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| Mythic Legends | | Mythic Legends | 8-BIT-ATTACK-2 | 2020 | Petersen Games | 8-Bit Attack | |
| Mythos Bestiary | 292-411 | Sandy Petersen's Cthulhu Mythos | | 2016 | Petersen Games | Pathfinder | |
| Mythos Comparative SIZes | 5 | Fragments of Fear | CHA2310 | 1985 | Chaosium | Call of Cthulhu (Classic) | |
| A Mythos Grimoire | 191-218 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| A Mythos Grimoire | 217-247 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| Mythos Items and Artifacts | 142-169 | Sandy Petersen's Cthulhu Mythos | | 2016 | Petersen Games | Pathfinder | |
| Mythos Items and Texts | 119-138 | Sandy Petersen's Cthulhu Mythos | | 2019 | Petersen Games | Dungeons and Dragons | |
| Mythos Monsters | 277-418 | Sandy Petersen's Cthulhu Mythos | | 2019 | Petersen Games | Dungeons and Dragons | |
| Mythos Player Character Races | 7-36 | Sandy Petersen's Cthulhu Mythos | | 2019 | Petersen Games | Dungeons and Dragons | |
| Mythos Races | 8-51 | Sandy Petersen's Cthulhu Mythos | | 2016 | Petersen Games | Pathfinder | |
| Neutral Unit Identifiers | | Neutral Unit Identifiers | CW-U26 | 2019 | Petersen Games | Cthulhu Wars | |
| New Equipment | 12-14 | Cthulhu Now | CHA2322 | 1987 | Chaosium | Call of Cthulhu (Now) | |
| New Equipment | 1-10 | The 1990s Handbook | CHA2355 | 1995 | Chaosium | Call of Cthulhu (Classic) | |
| New Equipment | 12-14 | Cthulhu Now | CHA3307 | 1992 | Chaosium | Call of Cthulhu (Now) | |
| New Mythos Deities, Races, and Monsters | 29-31 | Fragments of Fear | CHA2310 | 1985 | Chaosium | Call of Cthulhu (Classic) | |
| New Spells | 21-25 | H.P. Lovecraft's Dreamlands | CHA3302 | 1988 | Chaosium | Call of Cthulhu (Dreamlands) | |
| New Spells | A:21-25 | H.P. Lovecraft's Dreamlands | CHA2315-X | 1986 | Chaosium | Call of Cthulhu (Dreamlands) | |
| New Spells | 21-25 | H.P. Lovecraft's Dreamlands | CHA3308 | 1992 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Next Steps | B:22 | Call of Cthulhu Starter Set | CHA23158-X | 2018 | Chaosium | Call of Cthulhu (Classic) | |
| Nightmares I | | Nightmares I | | 2021 | Petersen Games | Dungeons and Dragons | |
| Nithon | 1-36 | Nithon | | 2020 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Nodens | | Nodens | CW-U28 | 2019 | Petersen Games | Cthulhu Wars | |
| Notable Inhabitants and Creatures | 26-41 | H.P. Lovecraft's Dreamlands | CHA3302 | 1988 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Notable Inhabitants and Creatures | 26-41 | H.P. Lovecraft's Dreamlands | CHA3308 | 1992 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Notable Inhabitants and Creatures of the Dreamlands | A:26-39 | H.P. Lovecraft's Dreamlands | CHA2315-X | 1986 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Notes on a Fragment of the Necronomicon | A:93-94 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | |
| Notes on a Fragment of the Necronomicon | 187-188 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| Omega Master Rulebook | | Omega Master Rulebook | CW-E12 | 2017 | Petersen Games | Cthulhu Wars | |
| Onslaught 3 Stretch Goal Box | | Onslaught 3 Stretch Goal Box | CW-E20 | 2019 | Petersen Games | Cthulhu Wars | |
| Opener of the Way | | Opener of the Way | CW-F1 | 2015 | Petersen Games | Cthulhu Wars | |
| Oratorio | 1-74 | Oratorio | | 2021 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Orientation | 9-17 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| Other Occupations | B:10 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | |
| Other Occupations | 104 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| Other Senses | 18-19 | Different Worlds | 28 | Apr 1983 | Chaosium | Call of Cthulhu (Classic) | |
| Oversized 3-5 Player Earth Map | | Oversized 3-5 Player Earth Map | CW-M13 | 2018 | Petersen Games | Cthulhu Wars | |
| An Overview of the Game | 5-10 | Call of Cthulhu 7th Edition Quick Start | CHA23131 | 2013 | Chaosium | Call of Cthulhu (Classic) | |
| Painted Gate | | Painted Gate | RPG-E1 | 2019 | Petersen Games | Cthulhu Wars | |
| Panacea | 69-106 | Petersen's Abominations | CHA23152 | 2017 | Chaosium | Call of Cthulhu (Now) | |
| People of the Dreamlands | 81-91 | H.P. Lovecraft's Dreamlands | CHA2394 | 2004 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Personalities | 187-190 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Personalities | 212-216 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| Personalities from Lovecraft's Tales | 138-142 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| Places | 10-20 | H.P. Lovecraft's Dreamlands | CHA3302 | 1988 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Places | A:10-21 | H.P. Lovecraft's Dreamlands | CHA2315-X | 1986 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Places | 10-20 | H.P. Lovecraft's Dreamlands | CHA3308 | 1992 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Player Character Options | 37-69 | Sandy Petersen's Cthulhu Mythos | | 2019 | Petersen Games | Dungeons and Dragons | |
| Playing the Game | 184-220 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Playing the Game | 184-220 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| Playing the Game | 88-95 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Potential Problems in LARPs | 1996 |  hyperwerx.net | | | Self Published | Call of Cthulhu (Classic) | |
| The Prehistory War | | The Prehistory War | | 2021 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Primeval Earth Map | | Primeval Earth Map | CW-M01 | 2015 | Petersen Games | Cthulhu Wars | |
| Prisons | 149-151 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| The Prophetess | | The Prophetess | | 2019 | Petersen Games | Cthulhu Wars | |
| Punch Board Faction Cards | | Punch Board Faction Cards | CW-E10 | 2017 | Petersen Games | Cthulhu Wars | |
| Ramsey Campbell Horrors Pack 1 | | Ramsey Campbell Horrors Pack 1 | CW-RC1 | 2016 | Petersen Games | Cthulhu Wars | |
| Ramsey Campbell Horrors Pack 2 | | Ramsey Campbell Horrors Pack 2 | CW-RC2 | 2016 | Petersen Games | Cthulhu Wars | |
| Reference | 106-249 | Call of Cthulhu | CHA2396 | 2004 | Chaosium | Call of Cthulhu (Classic) | |
| Reference | 106-249 | Call of Cthulhu | CHA23126 | 2011 | Chaosium | Call of Cthulhu (Classic) | |
| Reference | 106-249 | Call of Cthulhu | CHA2009-H | 2006 | Chaosium | Call of Cthulhu (Classic) | |
| Researches | 156-163 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Rewards of Success | B:22 | Call of Cthulhu Starter Set | CHA23158-X | 2018 | Chaosium | Call of Cthulhu (Classic) | |
| The Rise of R'lyeh | 57-62 | Cthulhu Classics | CHA3301 | 1989 | Chaosium | Call of Cthulhu (Classic) | Pacific Ocean; 1920s; Cthulhu |
| The Rise of R'lyeh | 126-135 | Shadows of Yog-Sothoth | CHA2397 | 2004 | Chaosium | Call of Cthulhu (Classic) | Pacific Ocean; 1920s; Cthulhu |
| The Rise of R'lyeh | 57-62 | Shadows of Yog-Sothoth | CHA2010 | 1982 | Chaosium | Call of Cthulhu (Classic) | Pacific Ocean; 1920s; Cthulhu |
| The Ritual | 1-50 | The Ritual | | 2020 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Ritual Curses | 4 | Fragments of Fear | CHA2310 | 1985 | Chaosium | Call of Cthulhu (Classic) | |
| Ritual Curses | 177 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Rules and Skills | 48-67 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Rules and Skills | 51-74 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| Rulesbook Additions | 137-145 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| S. Petersen's Field Guide to Creatures of the Dreamlands | 8-63 | S. Petersen's Field Guide to Creatures of the Dreamlands | CHA5107 | 1989 | Chaosium | Call of Cthulhu (Dreamlands) | |
| S. Petersen's Field Guide to Cthulhu Monsters | 6-63 | S. Petersen's Field Guide to Cthulhu Monsters | CHA5105 | 1988 | Chaosium | Call of Cthulhu (Classic) | |
| Sample Gear and Prices | 216-221 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| Sandy | | Hastur Rising | | 2022 | Petersen Games | Cthulhu Wars | |
| Sandy Petersen's Rules of Game Design | | Ye Booke of Tentacles | 4 | 2003 | The Chaos Society | Call of Cthulhu (Classic) | |
| Sanity | A:26-31 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | |
| Sanity | 28-36 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| Sanity | 154-169 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Sanity | B:23-27 | Call of Cthulhu | CHA2009-X | 1981 | Chaosium | Call of Cthulhu (Classic) | |
| Sanity | B:16-17 | Call of Cthulhu Starter Set | CHA23158-X | 2018 | Chaosium | Call of Cthulhu (Classic) | |
| Sanity | 154-169 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| Sanity | 30-36 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Sanity and Insanity | 68-79 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Sanity and Insanity | 75-87 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| Sanity and Insanity | 46-52 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| The Secret of Castronegro | 128-141 | Cthulhu Classics | CHA3301 | 1989 | Chaosium | Call of Cthulhu (Classic) | New Mexico; October |
| The Secret of Castronegro | 46-59 | Cthulhu Companion | CHA2304 | 1983 | Chaosium | Call of Cthulhu (Classic) | New Mexico; October |
| The Secret of Castronegro | 166-179 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | New Mexico; October |
| Shaggai Map | | Shaggai Map | CW-M11 | 2019 | Petersen Games | Cthulhu Wars | |
| Shining Trapezohedron Marker Pack | | Shining Trapezohedron Marker Pack | CW-E15 | 2017 | Petersen Games | Cthulhu Wars | |
| Skills | 54-79 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Skills | B:12-21 | Call of Cthulhu | CHA2009-X | 1981 | Chaosium | Call of Cthulhu (Classic) | |
| Skills | 54-79 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| Skin Deep | | Skin Deep | | 2022 | Petersen Games | Dungeons and Dragons | Fantasy World |
| The Sleeper | | The Sleeper | CW-F2 | 2015 | Petersen Games | Cthulhu Wars | |
| The Sleeper Rising | | The Sleeper Rising | | 2021 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Smell Like a Monster | | Smell Like a Monster | | 2022 | Petersen Games | Cthulhu Wars | |
| Something About Cats | | Something About Cats | | 2020 | Petersen Games | Cthulhu Wars | |
| Spellcasting in the Mythos | 85-118 | Sandy Petersen's Cthulhu Mythos | | 2019 | Petersen Games | Dungeons and Dragons | |
| Spells: A Grimoire | 166-176 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Stage Rehearsal | 1-54 | Stage Rehearsal | | 2021 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Starspawn | | Starspawn | | 2024 | Petersen Games | Hyperspace | |
| Tcho-Tcho | | Tcho-Tcho | CW-F5 | 2017 | Petersen Games | Cthulhu Wars | |
| Tcho-Tcho Tribes | | Tcho-Tcho Tribes | | 2020 | Petersen Games | Cthulhu Wars | |
| The Ten Commandments of Cthulhu Hunting | 121-123 | Cthulhu Casebook | CHA3305 | 1990 | Chaosium | Call of Cthulhu (Classic) | |
| The Ten Commandments of Directing a LARP | 1996 | hyperwerx.net | | | Self Published | Call of Cthulhu (Classic) | |
| Terror Paths | | Terror Paths | | 2022 | Petersen Games | Terror Paths | |
| Theomachy: The Warrior Gods | | Theomachy: The Warrior Gods | | 2016 | Petersen Games | Theomachy | |
| Through the Gate of Deeper Slumber | 8-16 | H.P. Lovecraft's Dreamlands | CHA2394 | 2004 | Chaosium | Call of Cthulhu (Dreamlands) | |
| Time | 134-139 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Tomes of Eldritch Lore | 224-238 | Keeper Rulebook | CHA23135 | 2015 | Chaosium | Call of Cthulhu (Classic) | |
| Tomes of Eldritch Lore | 224-238 | Keeper Rulebook | CHA23175 | 2021 | Chaosium | Call of Cthulhu (Classic) | |
| Transport | 214-215 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | Call of Cthulhu (Classic) | |
| Traveling: Land, Sea and Air | 250-253 | Call of Cthulhu | CHA2386 | 1999 | Chaosium | Call of Cthulhu (Classic) | |
| Traveling: Land, Sea and Air | 284-287 | Call of Cthulhu | CHA23106 | 2005 | Chaosium | Call of Cthulhu (Classic) | |
| Two New Types of Insanity | 19 | Cthulhu Companion | CHA2304 | 1983 | Chaosium | Call of Cthulhu (Classic) | |
| The Underground Menace | A-D | Fragments of Fear | CHA2310 | 1985 | Chaosium | Call of Cthulhu (Classic) | Democratic Republic of the Congo; Byakhee; Flying Polyp |
| Underground Menace | 18-21 | Different Worlds | 19 | Feb 1982 | Chaosium | Call of Cthulhu (Classic) | Michigan; 1920s; Dark Young of Shub-Niggurath |
| The Underground Menace | 102-106 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| Unique High Priests | | Unique High Priests | | 2016 | Petersen Games | Cthulhu Wars | |
| Unnameable | | Unnameable | CW-U25 | 2019 | Petersen Games | Cthulhu Wars | |
| Upgraded Ritual and Doom Tracks | | Upgraded Ritual and Doom Tracks | CW-U11 | 2017 | Petersen Games | Cthulhu Wars | |
| Using This Book | 1-6 | Sandy Petersen's Cthulhu Mythos | | 2019 | Petersen Games | Dungeons and Dragons | |
| Utilities | 280-317 | Call of Cthulhu | CHA2396 | 2004 | Chaosium | Call of Cthulhu (Classic) | |
| Utilities | 280-317 | Call of Cthulhu | CHA23126 | 2011 | Chaosium | Call of Cthulhu (Classic) | |
| Utilities | 280-317 | Call of Cthulhu | CHA2009-H | 2006 | Chaosium | Call of Cthulhu (Classic) | |
| Voice Over the Phone | 149-185 | Petersen's Abominations | CHA23152 | 2017 | Chaosium | Call of Cthulhu (Now) | Texas |
| Voyage to Farzeen | 1-46 | Voyage to Farzeen | | 2019 | Petersen Games | Dungeons and Dragons | Fantasy World |
| Weapons | B:22-24 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | Call of Cthulhu (Classic) | |
| Weapons | 113-115 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | Call of Cthulhu (Classic) | |
| Weapons | 146-148 | Call of Cthulhu | CHA2324 | 1989 | Chaosium | Call of Cthulhu (Classic) | |
| What is the Call of Cthulhu? | B:3-6 | Call of Cthulhu Starter Set | CHA23158-X | 2018 | Chaosium | Call of Cthulhu (Classic) | |
| The Windwalker | | The Windwalker | CW-F3 | 2015 | Petersen Games | Cthulhu Wars | |
| The Worm That Walks | 40-46 | Cthulhu Classics | CHA3301 | 1989 | Chaosium | Call of Cthulhu (Classic) | Maine; 1920s; Mi-Go |
| The Worm That Walks | 92-104 | Shadows of Yog-Sothoth | CHA2397 | 2004 | Chaosium | Call of Cthulhu (Classic) | Maine; 1920s; Mi-Go |
| The Worm That Walks | 40-46 | Shadows of Yog-Sothoth | CHA2010 | 1982 | Chaosium | Call of Cthulhu (Classic) | Maine; 1920s; Mi-Go |
| Yog-Sothothery | | Yog-Sothothery | 8-BIT-ATTACK-1 | 2020 | Petersen Games | 8-Bit Attack | |
| Yuggoth Map | | Yuggoth Map | CW-M03 | 2015 | Petersen Games | Cthulhu Wars | |
| The Zepzeg Cycle | 1-42 | The Zepzeg Cycle | | 2020 | Petersen Games | Dungeons and Dragons | Fantasy World |
