Title | Pages | Publication | Code | Date | Publisher |
O Apple Tree | Apr 2009 | talesofterror.net | | n/a | Self Published | |
O' Sleeper! Arise! | 139-146 | Secrets of Tibet | CHA23129 | 2013 | Chaosium | |
O.E.S. Ring | Support (F) | Lost Rites | CT56 | 2012 | Fantasy Flight | |
Oath of Blood | 15-24 | Blood Brothers | CHA2329 | 1990 | Chaosium | |
Oath of the Coven | Spell (F) | Rosemary's Baby | | n/a | Self Published | |
Oath-bound Servant | Character (U) | Eldritch Edition | | 2005 | Fantasy Flight | |
O'Bannion Enforcer | Character (C) | Arkham Edition | | 2004 | Fantasy Flight | |
O'Bannion Gunsels | Character (C) | Arkham Edition | | 2004 | Fantasy Flight | |
O'Bannion Gunsels | Character (F) | Arkham Premium | | 2004 | Fantasy Flight | |
O'Bannion Gunsels | Character (F) | Arkham Premium | | 2004 | Fantasy Flight | |
O'Bannion Gunsels | Character (F) | Arkham Premium | | 2004 | Fantasy Flight | |
O'Bannion Gunsels | Character (F) | Arkham Premium | | 2004 | Fantasy Flight | |
O'Bannion Thug | Character (U) | Unspeakable Tales | | 2004 | Fantasy Flight | |
O'Bannion Warehouse | Support (F) | Eldritch Premium | | 2005 | Fantasy Flight | |
O'Bannion Warehouse | Support (U) | Unspeakable Tales | | 2004 | Fantasy Flight | |
O'Bannion's Inner Council | Character (F) | Denizens of the Underworld | CT62 | 2014 | Fantasy Flight | |
O'Bannion's Ledger | Support (F) | Words of Power | CT54 | 2012 | Fantasy Flight | |
Obed Marsh Memorial | Location (U) | New Aeon | CAO1311-1 | 1997 | Chaosium | |
The Obelisk of Teg Suturloc | Oct 2020 | shoggoth.net | | n/a | Self Published | |
Object 318JB (Document #8366) | 1999 | delta-green.com | | n/a | Pagan Publishing | |
Objets de Magie | 74-83 | Unveiled Threats | WDF23600 | 2011 | WildFire Games | |
The Obligatory Cthulhu Set | | The Obligatory Cthulhu Set | AEG 5503 | 2013 | Alderac Entertainment Group | |
Oblique Strategies | Event (C) | Forgotten Cities | | 2005 | Fantasy Flight | |
Obliteration | Adventure (F) | House of Tindalos | | n/a | Self Published | |
Oblivion Circle | | More Tales of Terror | PAG2105 | 2000 | Pagan Publishing | |
Oblivion Circle | 2000 | talesofterror.net | | n/a | Self Published | |
Obscene Byakhee | Character (F) | Spawn of Madness | | 2006 | Fantasy Flight | |
Obscene Byakhee | Character (F) | Spawn of Madness | CT12e | 2011 | Fantasy Flight | |
Obscene Polyp | Character (C) | Masks of Nyarlathotep | | 2005 | Fantasy Flight | |
Obscure Linguist | Character (F) | Aspirations of Ascension | CT43 | 2011 | Fantasy Flight | |
Obscure Night of Torment | Adventure (F) | House of Tindalos | | n/a | Self Published | |
Obsequious Servants | Sep 2020 | shoggoth.net | | n/a | Self Published | |
Obsessed Federal Agent/Obsessed Agent in a Mi-Go Braincase | Investigator (C) | New Aeon | CAO1311-1 | 1997 | Chaosium | |
Obsessive Detective | Character (F) | The Twilight Beckons | CT40 | 2011 | Fantasy Flight | |
Obsessive Elder Thing | Character (F) | For the Greater Good | CT64 | 2015 | Fantasy Flight | |
Obsessive Inmate | Character (F) | The Thing from the Shore | CT23 | 2009 | Fantasy Flight | |
Obsessive Insomniac | Character (F) | In Memory of Day | CT27 | 2009 | Fantasy Flight | |
Obsessive Playwright | Character (F) | Murmurs of Evil | CT35 | 2010 | Fantasy Flight | |
Obsessive Research | Story (F) | Secrets of Arkham | CT32 | 2010 | Fantasy Flight | |
Obsessive Sycophant | Character (F) | The Breathing Jungle | CT49 | 2011 | Fantasy Flight | |
Obsessive Zealot | Character (F) | The Sleeper Below | CT63 | 2014 | Fantasy Flight | |
Obsessive/Compulsive | Event (R) | Limited | CAO1300-1 | 1996 | Chaosium | |
Obsideo Villa | 22-42 | Malum Umbra | CHA0353 | 2008 | Chaosium | |
The Occult | 23-25 | Green and Pleasant Land | CHA2320 | 1987 | Chaosium | |
The Occult | 38-42 | Mysteries of Ireland | CHA0408 | 2012 | Chaosium | |
Occult Books | 23-81 | The Keeper's Companion Vol 1 | CHA2388 | 2000 | Chaosium | |
Occult Books Bibliography | | The Unnamed | 3 | n/a | Self Published | |
Occult Engagement Protocols | 37-45 | As Above, So Below | CB71209 | 2015 | Cubicle 7 | |
Occult Groups (Minicults) | 16-24 | Mystic Alliances | CHA0363 | 2009 | Chaosium | |
Occult London | 72-77 | The London Guidebook | CHA2347 | 1996 | Chaosium | |
Occult Odds and Ends | | Occult Odds and Ends | | n/a | Self Published | |
Occult Organizations of the 1920's | 14-16 | Different Worlds | 45 | Mar 1987 | Chaosium | |
Occult Organizations of the 1920's | 14-16 | The Hungry Maggot | 2 | Mar 1995 | Self Published | |
Occult Shop | Support (R) | Unspeakable Tales | | 2004 | Fantasy Flight | |
Occult Tomes for CoC | | Chaosium Digest | v02n12 | Jul 1993 | Chaosium | |
An Occult Who's Who of the 1920s | 34-38 | Different Worlds | 43 | Jul 1986 | Chaosium | |
Occult Works | | Manic Depressive | 1 | 1985 | Self Published | |
The Occulted Light | 44-52 | Before the Fall | CHA2377 | 1998 | Chaosium | |
Occupations | 20-25 | The Apocalypse Machine | PELGT24 | 2011 | Pelgrane Press | |
Occupations | 23-27 | Cthulhu Apocalypse | PELGT40 | 2015 | Pelgrane Press | |
Occupations | 66-93 | Investigator's Handbook | CHA23136 | 2015 | Chaosium | |
Occupations | 38-45 | Keeper's Resource Book and Screen | PELGT04 | 2008 | Pelgrane Press | |
Occupations | 13-14 | The London Guidebook | CHA2347 | 1996 | Chaosium | |
Ocean Crawlers | Character (F) | Call of Cthulhu The Card Game | CT18 | 2008 | Fantasy Flight | |
Ocean Crawlers | Character (U) | Masks of Nyarlathotep | | 2005 | Fantasy Flight | |
The Ocean of Sand | 84-101 | Secrets of Morocco | CHA23105 | 2008 | Chaosium | |
Octomaid Promo Card | | Octomaid Promo Card | | Jun 2016 | Steve Jackson Games | |
Odd Behavior * | 80 | Taint of Madness | CHA2354 | 1995 | Chaosium | |
The Odd Ingredient * | 89 | Taint of Madness | CHA2354 | 1995 | Chaosium | |
Odder Than Odd | 18-21 | Polyhedron | 54 | Jul 1990 | TSR | |
Ode to a Shopkeeper | Adventure (F) | House of Tindalos | | n/a | Self Published | |
The Odin Disc | | Tales of Terror (II) | PAG2102 | 1996 | Pagan Publishing | |
Odin's Call | 72-94 | Spirits & Dreams of the Viking Age | CHA0390 | 2010 | Chaosium | |
Odontalgia | Jun 2008 | talesofterror.net | | n/a | Self Published | |
Of Angels and Bones | 3-21 | Halloween Horror 2 | CHA0333 | 2006 | Chaosium | |
Of Dreams and Dark Water | 177-207 | Goatswood and Less Pleasant Places | CHA2393 | 2001 | Chaosium | |
Of Evill Sorceries Done in New England of Daemons in no Humane Shape | 60-64 | The Arkham Gazette | 3 | Oct 2015 | Sentinel Hill Press | |
Of Grave Concern | 15-32 | Monophobia | 1001 | 2010 | Unbound Publishing | |
Of One Mind | Support (R) | Forgotten Cities | | 2005 | Fantasy Flight | |
Of Sound Mind and Body | 1-23 | Of Sound Mind and Body | | 2001 | Self Published | |
Of Wrath and Blood | | Of Wrath and Blood | | 2019 | Chaosium | |
Off-Duty Patrolman | Character (C) | Unspeakable Tales | | 2004 | Fantasy Flight | |
An Offer You Can’t Refuse | Event (F) | The Order of the Silver Twilight | CT33 | 2010 | Fantasy Flight | |
Office of Dr Hill | Location (F) | Rosemary's Baby | | n/a | Self Published | |
Office of Dr Sapirstein | Location (F) | Rosemary's Baby | | n/a | Self Published | |
The Office of Dr. Freud | Location (U) | Expeditions of Miskatonic University | CAO1301-1 | 1996 | Chaosium | |
The Office of Special Scientific Intelligence (Document #8417) | 1999 | delta-green.com | | n/a | Pagan Publishing | |
Officer Gibson | Character (F) | For the Greater Good | CT64 | 2015 | Fantasy Flight | |
Officer Nettler | Ally (F) | Rosemary's Baby | | n/a | Self Published | |
Oh No! The Carpet! | Event (F) | Rosemary's Baby | | n/a | Self Published | |
Oh No, My Glasses! | Event (F) | Scooby Doo Set 2 | | Mar 1999 | Self Published | |
Oily Grave | 10-11 | The Unspeakable Oath | 14/15 | 1997 | Pagan Publishing | |
Oklahoma | 104-125 | The Two-Headed Serpent | CHA23125 | 2017 | Chaosium | |
Ol' Lazy Eyes | Character (F) | Conspiracies of Chaos | | 2006 | Fantasy Flight | |
Ol' Lazy Eyes | Character (F) | Conspiracies of Chaos | CT14e | 2011 | Fantasy Flight | |
Olaus Wormius | Ally (U) | Legends of the Necronomicon | CAO1303-1 | 1996 | Chaosium | |
Old Acquaintance | 19-30 | Before the Fall | CHA2377 | 1998 | Chaosium | |
Old Arkham Cemetery | Location (C) | Limited | CAO1300-1 | 1996 | Chaosium | |
The Old Bell | Tome (F) | Scooby Doo Set 3 | | n/a | Self Published | |
Old Blood | 34-57 | 40 Adventures for Call of Cthulhu | | 2002 | Self Published | |
Old Blood | 1-23 | Old Blood | | 1996 | Self Published | |
Old Blood | 20-37 | Opifex Bimonthly | 5 | 1996 | Self Published | |
Old Brick Powderhouse | Location (C) | Dreamlands | CAO1307-1 | 1997 | Chaosium | |
The Old Cemetary | Location (F) | Sesqua Valley | | n/a | Self Published | |
The Old Church | | Tales of Terror (I) | | 1990 | Pagan Publishing | |
The Old Church | 17-18 | Tales of Terror (III) | | n/a | Self Published | |
The Old Church | 1990 | talesofterror.net | | n/a | Self Published | |
Old City Bazaar | Support (R) | Eldritch Edition | | 2005 | Fantasy Flight | |
Old Congregational Church | Location (F) | Unlimited | CAO1306-1 | 1997 | Chaosium | |
The Old Cottage | 2003 | talesofterror.net | | n/a | Self Published | |
The Old Damned House | 116-147 | Mansions of Madness | CHA23110 | 2007 | Chaosium | |
The Old Dark House | 60-67 | Alone on Halloween | PAG1000 | 1992 | Pagan Publishing | |
Old Farmhouse | Location (F) | Scooby Doo Set 1 | | n/a | Self Published | |
Old Fellow That Bunyip | 71-91 | Terror Australis | CHA2319 | 1987 | Chaosium | |
An Old Friend | 2002 | talesofterror.net | | n/a | Self Published | |
The Old Gibbet | Location (F) | Unlimited | CAO1306-1 | 1997 | Chaosium | |
The Old Grimoire | 77-96 | Cthulhu Dark Ages | CHA2398 | 2004 | Chaosium | |
Old Gypsy Woman | Ally (F) | Scooby Doo Set 1 | | n/a | Self Published | |
Old Hags | Oct 2005 | shoggoth.net | | n/a | Self Published | |
The Old House | | Nightwatch | 1 | Nov 1992 | Self Published | |
The Old Lady | 7 | Protodimension | 5 | Sum 2010 | Kinstaff Media | |
Old Man Grisby | Ally (F) | Scooby Doo Set 3 | | n/a | Self Published | |
Old Man Grisby's Place | Location (F) | Scooby Doo Set 3 | | n/a | Self Published | |
The Old Man of Damascus | | Cthulhu Live: The Old Man of Damascus | SKP0701 | 2007 | Skirmisher | |
Old Man of the Woods | Character (F) | The Order of the Silver Twilight | CT33 | 2010 | Fantasy Flight | |
Old Man Tompkins | | Old Man Tompkins | | 2019 | Chaosium | |
Old Man Whateley | Ally (R) | Expeditions of Miskatonic University | CAO1301-1 | 1996 | Chaosium | |
Old Mausoleum | Location (F) | Scooby Doo Set 2 | | Mar 1999 | Self Published | |
Old Mill Ruins | Location (C) | Expeditions of Miskatonic University | CAO1301-1 | 1996 | Chaosium | |
Old Mine Storehouse | Location (F) | Scooby Doo Set 2 | | Mar 1999 | Self Published | |
The Old Neighborhood | Support (R) | Masks of Nyarlathotep | | 2005 | Fantasy Flight | |
Old One | | Old One | | 2020 | Grimlord Games | |
Old Ones and Old Gods | 72-75 | Cthulhu Britannica: Folklore | CB7351 | 2012 | Cubicle 7 | |
Old Sawmill | Location (F) | Scooby Doo Set 1 | | n/a | Self Published | |
Old Sea Dog | Character (F) | The Path to Y'ha-nthlei | CT24 | 2009 | Fantasy Flight | |
The Old Serpent | 29-36 | Role Player Independent | 12 | Nov 1993 | Symbiosis Publishing | |
The Old Serpent | 19-33 | Role Player Independent | 13 | Dec 1993 | Symbiosis Publishing | |
The Old Serpent | | Role Player Independent | 14 | Feb 1994 | Symbiosis Publishing | |
Old Sins, Long Shadows | 4-15 | Shadows of Atlantis | MUH01022CS | 2015 | Modiphius Entertainment | |
The Old Straight Track | | Tales of Terror (I) | | 1990 | Pagan Publishing | |
The Old Straight Track | 14 | Tales of Terror (III) | | n/a | Self Published | |
The Old Straight Track | 1990 | talesofterror.net | | n/a | Self Published | |
Old West Investigators | 9-32 | Down Darker Trails | CHA23151 | 2017 | Chaosium | |
Old Witch's Shack | Location (F) | Scooby Doo Set 1 | | n/a | Self Published | |
Old Woman of the Enchanted Wood | Ally (U) | Dreamlands | CAO1307-1 | 1997 | Chaosium | |
Oliver Grayson | | Oliver Grayson | | 2011 | Fantasy Flight | |
Omar Shakti, Ageless Wizard | Character (R) | Eldritch Edition | | 2005 | Fantasy Flight | |
Omega Alumnus | Character (F) | Spawn of Madness | | 2006 | Fantasy Flight | |
Omega Alumnus | Character (F) | Spawn of Madness | CT12e | 2011 | Fantasy Flight | |
Omega Master Rulebook | | Omega Master Rulebook | CW-E12 | 2017 | Petersen Games | |
Omens of Ice | | Omens of Ice | SL17 | 2016 | Fantasy Flight | |
Omens of the Deep | | Omens of the Deep | SL19 | 2017 | Fantasy Flight | |
Omens of the Pharaoh | | Omens of the Pharaoh | SL20 | 2018 | Fantasy Flight | |
On a Bank by Moonlight | | A Cable's Length From Shore/On a Bank by Moonlight | PELGDGCC01 | 2018 | Pelgrane Press | |
On a Lonely Road | 18-19 | Lux in Tenebras | MRP0006 | 2011 | Miskatonic River Press | |
On Becoming an Investigator | 6-47 | 1920s Investigator's Companion Vol. II | CHA2346 | 1994 | Chaosium | |
On Borrowed Time | 49-61 | As Above, So Below | CB71209 | 2015 | Cubicle 7 | |
On Byakhee Wings | Event (R) | Unspeakable Tales | | 2004 | Fantasy Flight | |
On Cultists | B:10-12 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | |
On Cultists | 104-106 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | |
On Gaming in Averoigne | 58-60 | Worlds of Cthulhu | 1 | Aug 2004 | Pegasus Press | |
On Ice | Event (R) | Unspeakable Tales | | 2004 | Fantasy Flight | |
On Ilkla Moor Baht-at | 93-95 | Lovecraftesque | | 2016 | Black Armada | |
On Keeping Masks of Nyarlathotep | 20-28 | The Masks of Nyarlathotep Companion (Bloody Tongue) | 60-MONC-03 (?) | 2016 | Sixtystone Press | |
On Keeping Masks of Nyarlathotep | 20-28 | The Masks of Nyarlathotep Companion (Sand Bat) | 60-MONC-08 | 2016 | Sixtystone Press | |
On the Anti-Libertarian Nature of Cthulhu Worship | 12-13 | Valkyrie | 1 | Sep 1994 | Partizan Press | |
On the Banks of the Ohio | | On the Banks of the Ohio | | 2019 | Chaosium | |
On the Edge | | Chaosium Digest | v21n11 | Sep 1997 | Chaosium | |
On the Edge | Adventure (F) | Eric Johnson Mythos Collection | | n/a | Self Published | |
On the Edge | Adventure (R) | Limited | CAO1300-1 | 1996 | Chaosium | |
On The Edge | | Robo's Mythos CCG Web Page | | n/a | Self Published | |
On the Grift | Event (U) | Eldritch Edition | | 2005 | Fantasy Flight | |
On the Lam | Event (F) | Arkham Premium | | 2004 | Fantasy Flight | |
On the Lam | Event (F) | Denizens of the Underworld | CT62 | 2014 | Fantasy Flight | |
On the Mean Streets | Support (U) | Forbidden Relics | | 2004 | Fantasy Flight | |
On the Moon and In the Sea | | Chaosium Digest | v21n03 | Aug 1997 | Chaosium | |
On the Name 'Dagon' | 20-22 | The Arkham Gazette | 2 | Nov 2013 | Sentinel Hill Press | |
On the Road Again | 444-457 | The Masks of Nyarlathotep Companion (Bloody Tongue) | 60-MONC-03 (?) | 2016 | Sixtystone Press | |
On the Road Again | 572-586 | The Masks of Nyarlathotep Companion (Sand Bat) | 60-MONC-08 | 2016 | Sixtystone Press | |
On The Road to Nowhere | 1999 | talesofterror.net | | n/a | Self Published | |
On the Run | Event (F) | The Unspeakable Pages | CT57 | 2012 | Fantasy Flight | |
On the Take | Support (F) | For the Greater Good | CT64 | 2015 | Fantasy Flight | |
On the Threshold of Chapel Perilous | | The Once and Future King | | 1999 | Self Published | |
On the Ubiquity of Cthulhu | 5-6 | Fragments of Fear | CHA2310 | 1985 | Chaosium | |
On the Wings of Madness | 5-17 | Whispers from the Abyss | T-4 | 1984 | Theatre of the Mind Enterprises | |
On Ye Invitation and Leave-Taking of the Quiet One (Document #8187) | 1998 | delta-green.com | | n/a | Pagan Publishing | |
The Once and Future King | 57-60 | The Golden Dawn | PAG1004 | 1996 | Pagan Publishing | |
The Once and Future King * | | The Once and Future King | | 1999 | Self Published | |
A Once and Future King | 11-16 | The Whisperer | 1 | Sum 1999 | Severn Valley Press | |
Once Bitten | 1996 | Roleplay, What, Who, Why and Where? | | n/a | Self Published | |
Once in a Lifetime | 52-53 | Vade Mecum | WDF23001 | 2008 | WildFire Games | |
Once Risen, Twice Shy | 17 | White Dwarf | 66 | Jun 1985 | Games Workshop | |
One Dark and Stormy Night | Adventure (C) | Limited | CAO1300-1 | 1996 | Chaosium | |
One For the Money | 4-37 | One for the Money | PELGOC04D | 2017 | Pelgrane Press | |
One for the Road | Support (R) | Forgotten Cities | | 2005 | Fantasy Flight | |
One in Darkness | 75-86 | The Great Old Ones | CHA2321 | 1989 | Chaosium | |
One Man's Meat: Making the most of Poision in Role Playing Games | 52-54 | The Adventurer | 6 | Jan 1987 | Mersey Leisure Publishing | |
One of our Agents is Missing! | | Delta Green Anomalies | | n/a | Self Published | |
One of the Circle | | Chaosium Digest | v21n04 | Aug 1997 | Chaosium | |
One of the Circle | Adventure (U) | Cthulhu Rising | CAO1302-1 | 1996 | Chaosium | |
One of the Thousand | Character (F) | Perilous Trails | CT41 | 2011 | Fantasy Flight | |
One of Us | 1-39 | One of Us | | 2008 | Self Published | |
One of Us Becomes and Evil God! | | One of Us Becomes and Evil God! | | 2017 | AHC | |
One Small Step | Adventure (U) | New Aeon | CAO1311-1 | 1997 | Chaosium | |
One Starry Night | | d infinity | 3 | May 2012 | Skirmisher | |
One Step Beyond | 308-313 | Secrets of Japan | CHA2392 | 2005 | Chaosium | |
One Step Forward | 8-11 | Burning Horizon | WDF23301 | 2011 | WildFire Games | |
The One(s) That Got Away | Sep 2020 | shoggoth.net | | n/a | Self Published | |
One-In-All | Support (F) | The Key and the Gate | CT60 | 2013 | Fantasy Flight | |
One-Way Ticket | Support (R) | Forgotten Cities | | 2005 | Fantasy Flight | |
Oni | Oct 2019 | shoggoth.net | | n/a | Self Published | |
ONI Project PUZZLE | 118-120 | Delta Green Eyes Only | PAG1013 | 2007 | Pagan Publishing | |
ONI Project PUZZLE | 40-45 | Delta Green Eyes Only Vol 3: Project Rainbow | PAG2106 | 2000 | Pagan Publishing | |
Only After Dark | 23-42 | Book of Dark Wisdom | 1 | Sum 2003 | Elder Sign Press | |
Onslaught 3 Stretch Goal Box | | Onslaught 3 Stretch Goal Box | CW-E20 | 2019 | Petersen Games | |
Onto the Ice | 98-113 | Beyond the Mountains of Madness | CHA2380 | 1999 | Chaosium | |
Onward to Endurance | 73-84 | Walker in the Wastes | PAG1002 | 1994 | Pagan Publishing | |
The Onyx Temple | Location (U) | Dreamlands | CAO1307-1 | 1997 | Chaosium | |
The Ooze | 112-127 | Cthulhu Live | CHA6502 | 1997 | Chaosium | |
The Opal Throne | Location (C) | Dreamlands | CAO1307-1 | 1997 | Chaosium | |
Open for Inspection | Support (F) | Call of Cthulhu The Card Game | CT18 | 2008 | Fantasy Flight | |
Open for Inspection | Support (U) | Masks of Nyarlathotep | | 2005 | Fantasy Flight | |
Open Gate | Event (R) | Unspeakable Tales | | 2004 | Fantasy Flight | |
Open Grave | Support (F) | The Thing from the Shore | CT23 | 2009 | Fantasy Flight | |
The Opened Door | Story (F) | The Shifting Sands | CT47 | 2011 | Fantasy Flight | |
Opener of the Gate | Character (F) | Ancient Horrors | CT17 | 2008 | Fantasy Flight | |
Opener of the Way | | Opener of the Way | CW-F1 | 2015 | Petersen Games | |
Opening Act: The April Mix | 61-77 | Strange Songs | CHA0315 | 2005 | Chaosium | |
Opening Night | Story (F) | Call of Cthulhu The Card Game | CT18 | 2008 | Fantasy Flight | |
Opening Night | Conspiracy (F) | The Mark of Madness | CT66 | 2015 | Fantasy Flight | |
Opening Night | 19-27 | Tatters of the King | CHA23104 | 2006 | Chaosium | |
The opening of Every Gate | Event (P) | Eldritch Edition Promo | | 2005 | Fantasy Flight | |
Opening the Limbo Gate | Event (F) | Call of Cthulhu The Card Game | CT18 | 2008 | Fantasy Flight | |
Opening the Limbo Gate | Event (R) | Unspeakable Tales | | 2004 | Fantasy Flight | |
Opening the Third Eye | Event (F) | Eldritch Premium | | 2005 | Fantasy Flight | |
Opening the Third Eye | Event (C) | Unspeakable Tales | | 2004 | Fantasy Flight | |
Operation Arm's Length | 5 | Secret War Operations | | n/a | Modiphius Entertainment | |
Operation Bookworm | 10-11 | Secret War Operations | | n/a | Modiphius Entertainment | |
Operation Close Quarters | 6-7 | Secret War Operations | | n/a | Modiphius Entertainment | |
Operation Closed Casket | 12-13 | Secret War Operations | | n/a | Modiphius Entertainment | |
Operation Contagion | 1-3 | Operation Contagion | | 1997 | Self Published | |
Operation Dead Man Walking | 14-15 | Secret War Operations | | n/a | Modiphius Entertainment | |
Operation DUSTBOWL | | Operation DUSTBOWL | | 2017 | Self Published | |
Operation Header | 122-148 | World War Cthulhu: Cold War - Covert Actions | CB71972 | 2017 | Cubicle 7 | |
Operation Murky Waters | 8-9 | Secret War Operations | | n/a | Modiphius Entertainment | |
Operation Nemesis | Adventure (C) | New Aeon | CAO1311-1 | 1997 | Chaosium | |
Operation NITEFIRE | | Delta Green Anomalies | | n/a | Self Published | |
Operation PEA GREEN (Document #8435a) | 1999 | delta-green.com | | n/a | Pagan Publishing | |
Operation PEA GREEN (Document #8435b) | 1999 | delta-green.com | | n/a | Pagan Publishing | |
Operation SHOTGUN | | Delta Green Anomalies | | n/a | Self Published | |
Operation Stop Repo | 51-54 | The Unspeakable Oath | 25 | Jul 2018 | Pagan Publishing | |
Operation Turkey Shoot | 4 | Secret War Operations | | n/a | Modiphius Entertainment | |
Operative KRYPTER | | Delta Green Plausible Deniability | | n/a | Self Published | |
Ophelia Rising | 70-78 | Hudson and Brand, Inquiry Agents of the Obscure | 3004 | 2017 | Stygian Fox | |
Ophidian Blight | Event (F) | Curse of the Jade Emperor | CT48 | 2011 | Fantasy Flight | |
Opium Fiend | Character (C) | Eldritch Edition | | 2005 | Fantasy Flight | |
Optic Warehouse | Support (F) | The Wailer Below | CT37 | 2010 | Fantasy Flight | |
Optics | 79-80 | The Gaslight Equipment Catalogue | CHA0319 | 2005 | Chaosium | |
Optional Rules for the Old West | 45-52 | Down Darker Trails | CHA23151 | 2017 | Chaosium | |
Or, A Dragon Passant, Sable | 32-35 | The Last Province | 4 | n/a | Last Province Publishing | |
Orange and Ebola Sanity Tracks | | Eric Johnson Mythos Collection | | n/a | Self Published | |
The Ordentani | Oct 2019 | shoggoth.net | | n/a | Self Published | |
Order of the Stone | 61 | Fictional Reality | 12 | Jun 2003 | Self Published | |
The Order of the Sword of Saint Jerome | 35-48 | The Abbey | CHA0088 | 2004 | Chaosium | |
The Organ Doner | 2003 | talesofterror.net | | n/a | Self Published | |
Organisations | 34-41 | Jovian Nightmares | CHA0367 | 2009 | Chaosium | |
Organism 46b | Nov 2019 | Reckoning of the Dead | | n/a | Self Published | |
Organizations | 58-66 | The Armitage Files | PELGT10 | 2010 | Pelgrane Press | |
The Orient Express | Support (U) | Arkham Edition | | 2004 | Fantasy Flight | |
The Orient Express | A:11-18 | Horror on the Orient Express | CHA23130 | 2014 | Chaosium | |
The Orient Express | A:1-4 | Horror on the Orient Express | CHA2331-X | 1991 | Chaosium | |
Orientation | 6-13 | Arkham Unveiled | CHA2325 | 1990 | Chaosium | |
Orientation | 9-17 | Call of Cthulhu | CHA2336 | 1992 | Chaosium | |
Orientation | 9-15 | The Compact Arkham Unveiled | CHA2356 | 1995 | Chaosium | |
The Original, the Eternal, the Undying | Sep 2020 | shoggoth.net | | n/a | Self Published | |
Orlach Lives! | Adventure (F) | House of Tindalos | | n/a | Self Published | |
Orne Formula & Diagrams | Artifact (R) | Cthulhu Rising | CAO1302-1 | 1996 | Chaosium | |
Ornery Octal | 10-11 | Targets of Acquisition | CB61202 | 2015 | Cubicle 7 | |
Orne's Black | Spell (C) | Legends of the Necronomicon | CAO1303-1 | 1996 | Chaosium | |
Orphan School Horror | | Orphan School Horror | cr3005i | 2017 | Cthulhu Reborn | |
Osborn's General Store | Location (C) | Expeditions of Miskatonic University | CAO1301-1 | 1996 | Chaosium | |
The Osbrook House | 120-126 | Walker in the Wastes | PAG1002 | 1994 | Pagan Publishing | |
Oscar James | Ally (F) | Sesqua Valley | | n/a | Self Published | |
The Osiris Club | 161-186 | Cthulhu Live: Shades of Gray | 0008 | 2000 | Fantasy Flight | |
Otaheite | Location (C) | Cthulhu Rising | CAO1302-1 | 1996 | Chaosium | |
The Other Gods I | Adventure (F) | House of Tindalos | | n/a | Self Published | |
The Other Gods II | Adventure (F) | House of Tindalos | | n/a | Self Published | |
Other Investigator Organisations | 36-37 | World War Cthulhu: London | CB71941 | 2016 | Cubicle 7 | |
Other Locations | 32-33 | Jovian Nightmares | CHA0367 | 2009 | Chaosium | |
Other Mysteries of the Dawn | 61-62 | The Golden Dawn | PAG1004 | 1996 | Pagan Publishing | |
Other Occupations | B:10 | Call of Cthulhu | CHA2301-X | 1983 | Chaosium | |
Other Occupations | 104 | Call of Cthulhu | CHA2317-H | 1986 | Chaosium | |
The Other Path | Story (F) | Call of Cthulhu The Card Game | CT18 | 2008 | Fantasy Flight | |
The Other Place | 20-28 | God Game Black | CB71207 | 2013 | Cubicle 7 | |
The Other Secret War | 49-59 | Keeper's Guide to the Secret War | MPS01032CS | 2013 | Modiphius Entertainment | |
Other Senses | 18-19 | Different Worlds | 28 | Apr 1983 | Chaosium | |
The Otherworld | 13-20 | Spirits & Dreams of the Viking Age | CHA0390 | 2010 | Chaosium | |
The Oubliettes | Support (F) | The Order of the Silver Twilight | CT33 | 2010 | Fantasy Flight | |
Ouch! The Messy Problem of PC Injury | 4-? | Demonground | 12 | Jun 2001 | Self Published | |
Our Ladies of Sorrow | 126-131 | Our Ladies of Sorrow | MRP0005 | 2009 | Miskatonic River Press | |
Out For Blood | | More Tales of Terror | PAG2105 | 2000 | Pagan Publishing | |
Out Of My Mind | Adventure (R) | New Aeon | CAO1311-1 | 1997 | Chaosium | |
Out of Season Monsoon | Event (F) | Shadow of the Monolith | CT52 | 2012 | Fantasy Flight | |
Out of the Ages | 86-104 | Worlds of Cthulhu | 5 | Jan 2007 | Pegasus Press | |
Out of the Blue | | More Tales of Terror | PAG2105 | 2000 | Pagan Publishing | |
Out of the Celtic Twilight | 46-57 | Whispers in the Dark | 0003 | Oct 1993 | Triad Entertainments | |
Out of the Dark Realms in Between | 112-115 | Worlds of Cthulhu | 1 | Aug 2004 | Pegasus Press | |
Out of the Darkness | Event (F) | The Cacophony | CT39 | 2010 | Fantasy Flight | |
Out of the Depths | 140-156 | 40 Adventures for Call of Cthulhu | | 2002 | Self Published | |
Out of the Depths | 1-17 | Out of the Depths | | 1992 | Self Published | |
Out of the Mouths of Babes | | Serendipity's Circle | 11 | n/a | Self Published | |
Out of the Mouths of Babes and Children | | More Tales of Terror | PAG2105 | 2000 | Pagan Publishing | |
Out of the Ordinary | 7-? | Shadis | 41 | Oct 1997 | Alderac Entertainment Group | |
Out of the Past | | Out of the Past | | 2019 | Chaosium | |
Out of Your Head | Adventure (F) | Eric Johnson Mythos Collection | | n/a | Self Published | |
Outback Poacher | Character (F) | Shadow of the Monolith | CT52 | 2012 | Fantasy Flight | |
Outbreak | Adventure (U) | New Aeon | CAO1311-1 | 1997 | Chaosium | |
Outbreak Generator Charts | 54-56 | Protodimension | 4 | Spr 2010 | Kinstaff Media | |
An Outbreak of Cancer | | Tales of Terror (I) | | 1990 | Pagan Publishing | |
An Outbreak of Cancer | 13-14 | Tales of Terror (III) | | n/a | Self Published | |
An Outbreak of Cancer | 1990 | talesofterror.net | | n/a | Self Published | |
The Outer Boroughs | 99-132 | Secrets of New York | CHA23103 | 2005 | Chaosium | |
The Outer Order Curriculum | 39-43 | The Golden Dawn | PAG1004 | 1996 | Pagan Publishing | |
An Outer Space Adventure Idea | | Chaosium Digest | v07n08 | Sep 1994 | Chaosium | |
The Outlook Group | 106-123 | Delta Green Countdown | PAG1008 | 1999 | Pagan Publishing | |
Outlying Areas | 127-136 | Secrets of Los Angeles | CHA23111 | 2007 | Chaosium | |
Outmaneuvered | Event (F) | Denizens of the Underworld | CT62 | 2014 | Fantasy Flight | |
The Outpost of Progress | 73-78 | Secrets of the Congo | CHA0387 | 2010 | Chaosium | |
The Outside | 47-57 | The Cruel Empire of Tsan Chan | CHA0397 | 2010 | Chaosium | |
Outside the Laundry | 98-113 | Agent's Handbook | CB71203 | 2011 | Cubicle 7 | |
The Outsider | Adventure (R) | Limited | CAO1300-1 | 1996 | Chaosium | |
The Outsider Within | Oct 2020 | shoggoth.net | | n/a | Self Published | |
Outsiders and Psychic Abilities | 147-172 | Cthulhu Live | SKP0602 | 2006 | Skirmisher | |
Overdue | 47-52 | Bayt al Azif | 1 | Oct 2018 | Bayt al Azif Inc | |
Over-equipped Investigator | Character (U) | Eldritch Edition | | 2005 | Fantasy Flight | |
The Overlooked & The Unclear | | House of Tindalos | | n/a | Self Published | |
Oversized 3-5 Player Earth Map | | Oversized 3-5 Player Earth Map | CW-M13 | 2018 | Petersen Games | |
Overview of Extrico Tabula | 5-15 | Extrico Tabula | CHA0354 | 2008 | Chaosium | |
An Overview of Ireland 1919-1930 | 6-9 | Mysteries of Ireland | CHA0408 | 2012 | Chaosium | |
Overview of Malum Umbra | 5-11 | Malum Umbra | CHA0353 | 2008 | Chaosium | |
An Overview of the Game | 5-10 | Call of Cthulhu 7th Edition Quick Start | CHA23131 | 2013 | Chaosium | |
Overview of the Game | A:3-5 | Call of Cthulhu Starter Set | CHA23158-X | 2018 | Chaosium | |
Overwhelmed by Nightmares | Event (U) | Forbidden Relics | | 2004 | Fantasy Flight | |
Overworked Bureaucrat | Character (F) | For the Greater Good | CT64 | 2015 | Fantasy Flight | |
Overworked Graduate Student | Character (F) | Seekers of Knowledge | CT59 | 2012 | Fantasy Flight | |
Overworked Telephone Operator/Falsely Imprisoned Convict | Investigator (F) | Dreamlands | CAO1307-1 | 1997 | Chaosium | |
Overzealous Initiate | Character (F) | Call of Cthulhu The Card Game | CT18 | 2008 | Fantasy Flight | |
Overzealous Initiate | Character (C) | Eldritch Edition | | 2005 | Fantasy Flight | |
The Owlman | Oct 2014 | shoggoth.net | | n/a | Self Published | |
Ozzy Orne | Ally (C) | New Aeon | CAO1311-1 | 1997 | Chaosium | |