| Title | Code | Date | Publisher | System (Setting) |
|---|
 A Tableau of Red | | Mar 2020 | Noralle | Call of Cthulhu (Classic) |
 Tabletop Gaming | 48 | Nov 2020 | Warners Group Publications | Call of Cthulhu (Classic) |
| The Tager | | 2011 | Self Published | CthulhuTech |
 Tails of Terror * | GGP | | Golden Goblin Press | None |
| Tails of Valor | GGP1911 | 2019 | Golden Goblin Press | None, Call of Cthulhu (Catthulhu) |
| Taint of Madness | CHA2354 | 1995 | Chaosium | Call of Cthulhu (Classic) |
| Take the Force of the Blow | | 1999 | Self Published | Call of Cthulhu (Classic) |
| Taken for Granite | | Dec 2021 | Chaosium | Call of Cthulhu (Classic) |
| Tales from Failed Anatomies * | ARCTFFASC | | Arc Dream Publishing | Call of Cthulhu (Delta Green) |
| Tales From the Crucible | MPS01042G | 2013 | Modiphius Entertainment | Call of Cthulhu (Achtung!) |
| Tales From the Crucible * | | 2017 | Modiphius Entertainment | Call of Cthulhu (Achtung!) |
| Tales from Ye Dusty Olde Crap Shoppe | | Dec 2019 | Chaosium | Call of Cthulhu (Now) |
| Tales of Cthulhu Invictus * | GGP | | Golden Goblin Press | None |
| Tales of Death & Darkness | CHA0321 | 2005 | Chaosium | Call of Cthulhu (Classic) |
| Tales of Terror (I) | | 1990 | Pagan Publishing | Call of Cthulhu (Classic) |
| Tales of Terror (II) | PAG2102 | 1996 | Pagan Publishing | Call of Cthulhu (Classic) |
| Tales of Terror (III) | | | Self Published | Call of Cthulhu (Now), Call of Cthulhu (Classic) |
| Tales of the Caribbean | GGP1603 | 2016 | Golden Goblin Press | Call of Cthulhu (Classic) |
| Tales of the Casket Girls | | Aug 2021 | Chaosium | Call of Cthulhu (Classic) |
| Tales of the Crescent City | GGP1401 | 2014 | Golden Goblin Press | Call of Cthulhu (Classic) |
| Tales of the Miskatonic Valley | CHA2334 | 1991 | Chaosium | Call of Cthulhu (Classic) |
| Tales of the Sleepless City | MRP0011 | 2013 | Miskatonic River Press | Call of Cthulhu (Classic) |
| Tales of the White Beast | | Oct 2021 | Chaosium | Call of Cthulhu (Now) |
| Tales of the White Witchman * | MUH50364 | 2016 | Modiphius Entertainment | None |
| Tales out of Innsmouth * | CHA6024 | 2006 | Chaosium | Call of Cthulhu (Classic) |
 talesofterror.net | | | Self Published | Call of Cthulhu (Now), Call of Cthulhu (Classic) |
| Talien's Tower | | | Self Published | Call of Cthulhu (Classic), Call of Cthulhu (Now) |
| Taming the Waterwolf | | Aug 2019 | Chaosium | Call of Cthulhu (Strange Aeons) [19th Century] |
| The Taos Hum | | Nov 2023 | Stygian Fox | Call of Cthulhu (Gaslight) |
| Targets of Acquisition | CB61202 | 2015 | Cubicle 7 | Call of Cthulhu (Laundry) |
| Tarot of Cthulhu | HITE002 | 2008 | Ronin Arts | None |
| The Tartarus Intercept | | Jul 2022 | Chaosium | Call of Cthulhu (Strange Aeons) [2181] |
| Tatterdemallion | | 1988 | Self Published | Call of Cthulhu (Classic) |
| Tatters of the King | CHA23104 | 2006 | Chaosium | Call of Cthulhu (Classic) |
 TaZmania | | 2021 | SchilMil Games | AuZtralia |
| Tcho-Tcho | CW-F5 | 2017 | Petersen Games | Cthulhu Wars |
| Tcho-Tcho Tribes | | 2020 | Petersen Games | Cthulhu Wars |
| Teachers and Tentacles | | 2016 | Second Thought Games | Teachers and Tentacles |
| Tears of a Clown | | Jul 2022 | Chaosium | Call of Cthulhu (Gaslight) |
| Techlandia | | 2020 | 11231 Games | Techlandia |
| Teen Detective | | Nov 2017 | Self Published | Teen Detective |
| TekHL | | 2000 | Mind's Eye Publishing | TekHL |
| Telegrams | | Jan 2018 | Chaosium | Call of Cthulhu (Classic) |
| Tell Me, O Muse | | Jan 2024 | Chaosium | Call of Cthulhu (Classic) |
 Tempestuous Orifice | 3 | | Self Published | Call of Cthulhu (Classic) |
| Tempestuous Orifice * | 4 | 1984 | Self Published | Call of Cthulhu (Classic) |
| Templa Illuminatus | | Jan 2024 | Chaosium | Call of Cthulhu (Classic) |
| The Temple Drums | | Jul 2019 | Chaosium | Call of Cthulhu (Classic) |
| Temple in the Ice | | 2000 | Self Published | Call of Cthulhu (Now) |
| Temple of Dagon | | 2021 | Necromancer Games | Dungeons and Dragons |
| Temple of Dagon | | 2021 | Necromancer Games | Pathfinder |
| Temple of Dagon | | 2021 | Necromancer Games | Swords and Wizadry |
| Temple of the Crawling Chaos | | Oct 2024 | Chaosium | Call of Cthulhu (Classic) |
| Temple of the Old Ones | | 2020 | Heroic Maps | None |
| Temporary Insanity | | 2004 | Self Published | Call of Cthulhu (Now) |
| Ten | | Oct 2019 | Chaosium | Call of Cthulhu (Now) |
| Ten Destinations for the Vacationing Investigator | | Aug 2022 | Chaosium | Call of Cthulhu (Classic) |
| Tenants of Hell | SM05 | 2007 | Self Published | Call of Cthulhu (Rising) |
| Tentacles? Really?! | ICG7222 | 2016 | Inner City Games Designs | None |
| Terrible New Worlds | cr6104 | 2021 | Cthulhu Reborn | APOCTHULHU |
| Terrible Old Man Promo * | | 2014 | Passport Game Studios | Kingsport Festival |
| Terrible Tomes | | Nov 2023 | Chaosium | Call of Cthulhu (Classic) |
| Territory Blues | | | Self Published | Lovecraftesque |
| Terror | CHA0322 | 2005 | Chaosium | Call of Cthulhu (Classic) |
| Terror Australis | | | Self Published | Call of Cthulhu (Classic) |
| Terror Australis | CHA2319 | 1987 | Chaosium | Call of Cthulhu (Classic) |
| Terror Australis * | CHA23155 | 2018 | Chaosium | Call of Cthulhu (Classic) |
| Terror from the Skies | CHA23128 | 2012 | Chaosium | Call of Cthulhu (Classic) |
| Terror from the Stars | CHA2313 | 1986 | Chaosium | Call of Cthulhu (Classic) |
| Terror in Tangier | | Dec 2021 | Chaosium | Call of Cthulhu (Classic) |
| The Terror in the Tapestry | | Feb 2023 | Chaosium | Call of Cthulhu (Dark Ages) |
| Terror in the Theatre | | 2020 | Micro RPG | Terror in the Theatre |
 Terror in Venice | CT61 | 2013 | Fantasy Flight Games | Call of Cthulhu LCG |
| Terror Itself | | Dec 2017 | Chaosium | Call of Cthulhu (Classic) |
| Terror of Octobernomicon | GGP2201 | 2022 | Golden Goblin Press | Call of Cthulhu (Invictus), Call of Cthulhu (Darker Trails), Call of Cthulhu (Classic) |
| The Terror of the Tides | CT22 | 2009 | Fantasy Flight Games | Call of Cthulhu LCG |
| Terror on the Arkham Express * | | 2020 | Self Published | None |
| Terror on the Western Front! | | Jul 2022 | Chaosium | Call of Cthulhu (WWI) |
| Terror Paths | | 2022 | Petersen Games | Terror Paths |
| Terror Through Time | | May 2023 | Chaosium | Call of Cthulhu (Classic) |
| Terrors from Beyond | CHA23113 | 2009 | Chaosium | Call of Cthulhu (Classic) |
| Terrors of the Secret War | MUH050025AC | 2014 | Modiphius Entertainment | Call of Cthulhu (Achtung!) |
| Test Facility 3188 | EX01 | 2007 | Self Published | Call of Cthulhu (Rising) |
| Test Subjects | | Oct 2020 | Chaosium | Call of Cthulhu (Classic) |
| Thastygliax's Vault | | | Self Published | Mythos |
| That Which Consumes | CT45 | 2011 | Fantasy Flight Games | Call of Cthulhu LCG |
| A Theater of Flesh | | Dec 2022 | Chaosium | Call of Cthulhu (Classic) |
| Theft at the Peabody | | Oct 2021 | Chaosium | Call of Cthulhu (Now) |
| Theomachy: The Warrior Gods | | 2016 | Petersen Games | Theomachy |
| There is Something Wrong with the Rats | | 2021 | One Shot RPG | One Shot RPG |
| There is Something Wrong with the Rats * | | 2021 | One Shot RPG | Fate of Cthulhu |
| There's Gold in Them Thar Hills | | Dec 2021 | Chaosium | Call of Cthulhu (Darker Trails) |
| They Came from the Woods | | 2022 | Stardust Publications | Dark Aeons |
| Thin Jack | | 1992 | Self Published | Call of Cthulhu (Now) |
| The Thing at the Threshold | CHA2339 | 1992 | Chaosium | Call of Cthulhu (Classic) |
| The Thing from Jakarta | | 2002 | Self Published | Call of Cthulhu (Now) |
| The Thing from the Shore | CT23 | 2009 | Fantasy Flight Games | Call of Cthulhu LCG |
| The Thing in the Park | | 1996 | Self Published | Call of Cthulhu (Now) |
| The Thing in the Pines | | Jun 2023 | Chaosium | Call of Cthulhu (Classic) |
| The Thing in Tunnel 12 | | Sep 2022 | Chaosium | Call of Cthulhu (Now) |
| The Thing They Brought Back | | 2012 | Self Published | Call of Cthulhu (Classic) |
| Thing Torments Poet, Daimyo calls on greatest help, Will the players fail? | | May 2020 | Chaosium | Call of Cthulhu (Strange Aeons) [17th Century] |
| The Things We Feed | | Dec 2022 | Chaosium | Call of Cthulhu (Classic) |
| The Things We Leave Behind | TTWLB | 2016 | Stygian Fox | Call of Cthulhu (Classic) |
| Thirst for Knowledge | RR 3 | 2018 | Wayward Rogues Publishing | Pathfinder |
| The Thirteen | | 2017 | Stygian Fox | Call of Cthulhu (Classic) |
| The Thirteenth Convict | cr3005m | 2018 | Cthulhu Reborn | Call of Cthulhu (Convicts) |
| This Old Haunted House | CHA0361 | 2008 | Chaosium | Call of Cthulhu (Classic) |
| This Old Haunted House, Too | CHA0373 | 2009 | Chaosium | Call of Cthulhu (Classic) |
| Thorston, The Shunned Town on the Dee | FXC-06 | 2019 | Stygian Fox | Call of Cthulhu (Gaslight) |
| Those the Comet Brings | | Aug 2021 | Self Published | Call of Cthulhu (Atomic), GURPS (Horror) |
| Those Within | | 2018 | Chaosium | Call of Cthulhu (Gaslight) |
| Thou Didst Let Fall | cr5401 | Sep 2023 | Cthulhu Reborn | Cthulhu Eternal |
| A Thousand Shapes of Horror * | AHC40 | 2019 | Fantasy Flight Games | Arkham Horror: The Card Game |
| The Thousand Young | CT65 | 2015 | Fantasy Flight Games | Call of Cthulhu LCG |
| The Thrall | | 2010 | Stardust Publications | Dark Aeons |
| Threads | THC004 | 2020 | Matakishi's Tea House | The Cthulhu Hack |
| Threads of Fate * | AHC20 | 2018 | Fantasy Flight Games | Arkham Horror: The Card Game |
| Three Faces of the Wendigo | JCG018 | 2017 | Just Crunch Games | The Cthulhu Hack |
| Three Nights in Portsmouth | | 2015 | Purple Duck Games | Dungeon Crawl Classics |
| Thro' Centuries Fixed | | 2016 | Just Crunch Games | The Cthulhu Hack |
| Thro' Centuries Fixed * | JCG202 | 2023 | Just Crunch Games | The Cthulhu Hack |
| Throne of the Elder Gods | | 2021 | Heroic Maps | None |
| Throne-Bearers of the Death Goddess | | 2024 | Twin Engine Publishing | Cthulhu Eternal |
| Through a Dream, Darkly | | Jul 2019 | Dark Trapezohedron Productions | Call of Cthulhu (Dreamlands) |
| Through a Glass Darkly * | | 2011 | Arc Dream Publishing | Call of Cthulhu (Classic) |
| Thrown Voices | | Jul 2021 | Chaosium | Call of Cthulhu (Classic) |
| Thrusher Manor | | Dec 2019 | Self Published | GURPS (Horror), Call of Cthulhu (Classic) |
| The Thrushmoor Terror | PZO90110 | 2016 | Paizo Publishing | Pathfinder |
| Thunder God's Curse | cr5210 | Oct 2024 | Cthulhu Reborn | Cthulhu Eternal |
| Tickets Please | | Jan 2021 | Chaosium | Call of Cthulhu (Classic) |
| Tides of Madness | | 2016 | Portal Games | Tides of Madness |
| The Ties that Bind | SP1008 | 2013 | Stardust Publications | Dark Aeons |
| Tiger in Human Skin | | Mar 2024 | Chaosium | Call of Cthulhu (Classic) |
| Til Death Do Us Part | MAD04 | 2011 | Fantasy Flight Games | Mansions of Madness |
| A Time for Sacrifice | NCG-TFS-HC-01 | 2020 | New Comet Games | Call of Cthulhu (Classic) |
| Time of the Serpent | | Sep 2020 | Chaosium | Call of Cthulhu (Classic) |
| The Time Shadow Over Darnesville | | Nov 2021 | Chaosium | Call of Cthulhu (Classic) |
| A Time To Harvest * | CHA23176 | 2021 | Chaosium | Call of Cthulhu (Classic) |
| A Time to Harvest Episode 1 | | 2016 | Chaosium | Call of Cthulhu (Classic) |
| A Time to Harvest Episode 2 | | 2016 | Chaosium | Call of Cthulhu (Classic) |
| A Time to Harvest Episode 3 | | 2016 | Chaosium | Call of Cthulhu (Classic) |
| A Time to Harvest Episode 4 | | 2016 | Chaosium | Call of Cthulhu (Classic) |
| A Time to Harvest Episode 5 | | 2016 | Chaosium | Call of Cthulhu (Classic) |
| A Time to Harvest Episode 6 | | 2016 | Chaosium | Call of Cthulhu (Classic) |
| Time's Prisoners | | May 2023 | Chaosium | Call of Cthulhu (Regency) |
| The Timeless Terror | | Sep 2023 | Chaosium | Call of Cthulhu (Classic) |
| Timeout | 15 | | Self Published | None |
| Timeout | 16 | | Self Published | Call of Cthulhu (Classic) |
| Timeout | 17 | | Self Published | Call of Cthulhu (Classic) |
| Timeout | 20 | | Self Published | Call of Cthulhu (Classic) |
| Timeout | 21 | | Self Published | Call of Cthulhu (Classic) |
| Timeout | 5 | | Self Published | None |
| Tindalos RPG | | 2008 | Self Published | Tindalos |
| Tiny Cthulhu | GKG-071 | 2021 | Gallant Knight Games | Tiny Cthulhu |
| Tiny Epic Cthulhu | | 2024 | Gamelyn Games | Tiny Epic Cthulhu |
| Tiny Epic Cthulhu: Deluxe Edition * | | 2024 | Gamelyn Games | Tiny Epic Cthulhu |
| TinyZine | 38 | Oct 2021 | Gallant Knight Games | Tiny Cthulhu |
| TinyZine | 50 | Aug 2024 | Gallant Knight Games | Tiny Cthulhu |
| The Titan Incident | | Dec 2018 | Chaosium | Call of Cthulhu (Strange Aeons) [2189] |
| Titas of Arkham | | 2019 | Self Published | Titas of Arkham |
| To Eternity | | 2021 | Adreama Games | Machina Arcana |
| To Fight the Black Wind * | EAH14 | 2018 | Fantasy Flight Games | Arkham Horror |
| To Fight the Black Wind * | NAH14 | 2018 | Fantasy Flight Games | Arkham Horror: The Card Game |
| To Kill a Lie: 2nd Gig | | 2009 | Self Published | CthulhuTech |
| To The Tolling of the Bell | | Jun 2023 | Chaosium | Call of Cthulhu (Classic) |
| To Touch The Untouchable | cr5201 | 2022 | Cthulhu Reborn | Cthulhu Eternal |
| Tomb of Ash | | 2002 | Self Published | Call of Cthulhu (Now) |
| Tomb of Nyarlathotep | | 2015 | Self Published | Dungeons and Dragons |
| Tomb of the Aeons * | MUH050338 | 2015 | Modiphius Entertainment | None |
| Tomes and Spells | | 2018 | Sixpence Games | Cultists of Cthulhu |
| Tomes of Arkham | | 2024 | Self Published | Tomes of Arkham |
| Tomes of Blasphemous Knowledge | | 2013 | Cakebread and Walton | Dark Streets, Clockwork and Chivalry |
| Tomes of Cthulhu | AGT0064 | 2016 | Azukail Games | Call of Cthulhu (Classic) |
| Tomes of Cthulhu II | AGT0089 | 2018 | Azukail Games | Call of Cthulhu (Classic) |
| Tomes of Eldritch Lore Expanded | | Aug 2024 | Chaosium | Call of Cthulhu (Classic) |
| Tomes of Terror | | Jun 2018 | Chaosium | Call of Cthulhu (Classic) |
| Too Close to Home | | Aug 2019 | Chaosium | Call of Cthulhu (Now) |
| Torrent of Rebellion | | 2020 | Grimlord Games | The Everrain |
| Touched By Evil | | 2016 | UnPlayable Games | Touched By Evil |
| Touched by the Abyss | CT58 | 2012 | Fantasy Flight Games | Call of Cthulhu LCG |
| Tough Gains | | 2008 | Self Published | Yellow Dawn |
| Tourist Trap | | Dec 2022 | Chaosium | Call of Cthulhu (Now) |
| The Tower | | 2006 | Self Published | Call of Cthulhu (Dark Ages) |
| Tower of Hidden Doors | | 2016 | Wayward Rogues Publishing | Pathfinder |
| Tower of Madness | | 2018 | Smirk and Dagger Games | Tower of Madness |
| Towers of Am'harb | | 2019 | Moaideas Game Design | Towers of Am'harb |
| The Town of Brighton | | 2015 | Wayward Rogues Publishing | Pathfinder |
| The Town of Kirkbridges | | Apr 2020 | Chaosium | Call of Cthulhu (Now) |
| Toying With Humans | CHA0317 | 2005 | Chaosium | Call of Cthulhu (Now), Call of Cthulhu (WWII), Call of Cthulhu (Strange Aeons) [1970s] |
| Trade Character Sheets Promo Card | | Apr 2008 | Steve Jackson Games | Munchkin |
| Tradetalk | 3 | 1997 | The Chaos Society | Call of Cthulhu (Classic) |
| Tradetalk | 7 | 2000 | The Chaos Society | Call of Cthulhu (Classic) |
| Tradetalk | 11 | 2002 | The Chaos Society | Call of Cthulhu (Classic) |
| Tradetalk | 13 | 2004 | The Chaos Society | Call of Cthulhu (Classic) |
 Trail of Cthulhu | PELGT01 | 2007 | Pelgrane Press | Trail of Cthulhu |
| Trail of Cthulhu Condensed Rules | | | Pelgrane Press | Call of Cthulhu (Classic) |
| Trail of Cthulhu Quickstart Rules | PELGT201QS | Oct 2024 | Pelgrane Press | Trail of Cthulhu |
| Trail of Cthulhu: Player's Guide | PELGT03D | 2007 | Pelgrane Press | Trail of Cthulhu |
| Trail of the Golden Spike * | Hero 14 | 1984 | Hero Games | Justice Inc, Call of Cthulhu (Classic) |
| Trail of the Loathsome Slime | MM1 | 1985 | Games Workshop | Call of Cthulhu (Classic) |
| Trail of the Monolith | | Dec 2017 | Chaosium | Call of Cthulhu (Classic) |
| The Trail of Tsathoggua | CHA2308 | 1984 | Chaosium | Call of Cthulhu (Classic) |
| The Transactions of the Royal Martian Geographical Society | 1 | 1991 | Self Published | Space 1889, Call of Cthulhu (Gaslight) |
| The Transactions of the Royal Martian Geographical Society | 2 | 1991 | Self Published | Space 1889, Call of Cthulhu (Gaslight) |
| The Transactions of the Royal Martian Geographical Society | 3 | 1992 | Self Published | Call of Cthulhu (Gaslight) |
| The Transactions of the Royal Martian Geographical Society | 4 | 1992 | Self Published | Call of Cthulhu (Gaslight), Space 1889 |
| The Transformation of Henrietta Z. | | 2017 | Self Published | Delta Green |
| The Transition of Ludvig Prinn | | 2015 | Self Published | Trail of Cthulhu |
| A Translation of Evil | SG-MT3 | 2012 | Spectrum Games | Macabre Tales |
| The Transmigration of the Emerald Lama | | May 2020 | Chaosium | Call of Cthulhu (Now) |
| Treasure for the Watcher | | Sep 2021 | Chaosium | Call of Cthulhu (Darker Trails) |
| The Trellborg Monstrosities | MPS01021C | 2013 | Modiphius Entertainment | Call of Cthulhu (Achtung!) |
| The Trellborg Monstrosities | MPS01021S | 2013 | Modiphius Entertainment | Savage Worlds (Achtung!) |
| The Trellborg Monstrosities * | MPS01021F | 2014 | Modiphius Entertainment | None |
| tremulus | | 2012 | Reality Blurs | tremulus |
| Trent Sterling's Guide to the Wild Volume 1 | | Nov 2022 | Chaosium | Call of Cthulhu (Classic) |
| Trials of Boozer | | Oct 2021 | Chaosium | Call of Cthulhu (Classic) |
| Tribal Dance | | | Self Published | Call of Cthulhu (Now) |
| Trick or Treat 2 | | Oct 2022 | Chaosium | Call of Cthulhu (Now) |
| Tricolour Terror | cr3005b | 2016 | Cthulhu Reborn | Call of Cthulhu (Convicts) |
| Trilogy of Awesome + 1 | ToA+1 | 2016 | Kort'thalis Publishing | The Outer Presence, Crimson Dragon Slayer |
| Trilogy of Awesome Returns + 1 | ToAR+1 | 2017 | Kort'thalis Publishing | The Outer Presence |
| The Trismegistus Club | | 2010 | Miskatonic River Press | Call of Cthulhu (Gaslight) |
| Trizine | 3 | | Self Published | Call of Cthulhu (Classic) |
| Trizine | 2 | 1986 | Self Published | Call of Cthulhu (Classic) |
| Trophies | | 2000 | Self Published | Call of Cthulhu (Classic) |
| Trouble at Scarrick Isle | | Oct 2024 | Chaosium | Call of Cthulhu (Classic) |
| Trouble in Pinewood | | Jul 2021 | Chaosium | Call of Cthulhu (Classic) |
| Trouble in Threes - Spring | | May 2019 | Chaosium | Call of Cthulhu (Now) |
| Trouble in Threes - Summer | | Jul 2019 | Chaosium | Call of Cthulhu (Now) |
| Trouble on the Rock | | Dec 2023 | Chaosium | Call of Cthulhu (Classic) |
| The True Housewives of Arkham | | Oct 2022 | Chaosium | Call of Cthulhu (Now) |
| Trutz Blanke Hans | | Aug 2021 | Chaosium | Call of Cthulhu (Classic) |
| The Tsathoggua Cycle * | CHA6029 | 2003 | Chaosium | Call of Cthulhu (Classic) |
| Tuesday Terribles | 1 | Sep 2007 | Chaosium | Call of Cthulhu (Classic) |
| Tuesday Terribles | 2 | Sep 2007 | Chaosium | Call of Cthulhu (Classic) |
| Tuesday Terribles | 3 | Sep 2007 | Chaosium | Call of Cthulhu (Classic) |
| Tuesday Terribles | 4 | Sep 2007 | Chaosium | Call of Cthulhu (Classic) |
| Tuesday Terribles | 5 | Oct 2007 | Chaosium | Call of Cthulhu (Classic) |
| Tuesday Terribles | 6 | Oct 2007 | Chaosium | Call of Cthulhu (Classic) |
| Tuesday Terribles | 7 | Oct 2007 | Chaosium | Call of Cthulhu (Classic) |
| Tuesday Terribles | 8 | Oct 2007 | Chaosium | Call of Cthulhu (Classic) |
| The Tunnel People | | Aug 2023 | Chaosium | Call of Cthulhu (Now) |
| The Tunnels Under Temple Meads | | Dec 2022 | Chaosium | Call of Cthulhu (Classic) |
| Tuorsjaure | | Sep 2023 | Chaosium | Call of Cthulhu (Now) |
| Turbulence | WDF33403 | 2014 | WildFire Games | The Void |
| The Turbulent Mason | cr3005n | 2018 | Cthulhu Reborn | Call of Cthulhu (Convicts) |
| Turn to Stone | | 2007 | Self Published | Call of Cthulhu (Classic) |
| Twelve Black Feathers | | May 2023 | Chaosium | Call of Cthulhu (Gaslight) |
| The Twilight Beckons | CT40 | 2011 | Fantasy Flight Games | Call of Cthulhu LCG |
| Twilight Flood | | 2020 | Grimlord Games | The Everrain |
| Twilight Horror | CT26 | 2009 | Fantasy Flight Games | Call of Cthulhu LCG |
| Twilight Memoirs | CHA0325 | 2005 | Chaosium | Call of Cthulhu (Classic) |
| The Twinning of Alice Twickelbee | | Jun 2022 | Chaosium | Call of Cthulhu (Classic) |
| The Two-Headed Serpent | CHA23125 | 2017 | Chaosium | Call of Cthulhu (Classic) |