| Publication | Code | Date | Publisher | System (Setting) |
|---|
 I Am Providence | | 2014 | Self Published | I Am Providence
|
| I Am the Fourth Wall | | 2019 | Slinky Gibbon Games | I Am the Fourth Wall
|
 I Pray God Will Curse the Writer | | 2016 | Teapot Dome Games | I Pray God Will Curse the Writer
|
| I Want to Play | FXC-07 | 2019 | Stygian Fox | Call of Cthulhu (Now)
|
| I Want You to Kill the Ice Cream Man | | 2000 | Self Published | Call of Cthulhu (Now)
|
| Iaa! Cthulhu! Fhtagn! | | 2016 | Sphinx Speileverlag | Iaa! Cthulhu! Fhtagn!
|
| Ice Cream Man * | | May 2019 | Chaosium | Call of Cthulhu (Now)
|
| The Idol of Thoth | | Dec 2017 | Stygian Fox | Call of Cthulhu (Classic)
|
| Igor Ichor Promo Card | | Mar 2009 | Steve Jackson Games | Munchkin
|
| Ill Omens Art Pack | | Dec 2017 | Chaosium | Call of Cthulhu (Classic)
|
 Imagine | 13 | Apr 1984 | TSR | Call of Cthulhu (Classic)
, None
|
| Imagine | 28 | Jul 1985 | TSR | Call of Cthulhu (Classic)
, Daredevils
, None
|
 Imazine | 16 | 1987 | Self Published | Call of Cthulhu (Classic)
|
| The Immortal Minority | 2 | 1987 | Self Published | Call of Cthulhu (Classic)
|
| The Impaler | | 1984 | Self Published | Call of Cthulhu (Classic)
|
 Impossible Landscapes | APU8145 | 2021 | Arc Dream Publishing | Delta Green
|
| In a Different Light | | 2011 | Cthulhu Reborn | Call of Cthulhu (Classic)
|
| In From the Cold * | | 2017 | Golden Goblin Press | Call of Cthulhu (Classic)
|
 In Memory of Day | CT27 | 2009 | Fantasy Flight Games | Call of Cthulhu LCG
|
 In Search of Sanity | PZO90109 | 2016 | Paizo Publishing | Pathfinder
|
| In Strange Aeons: Lovecraftian Numenera | MCG014P | 2013 | Monte Cook Games | Numenera
|
| In the Clutches of Chaos * | AHC34 | 2019 | Fantasy Flight Games | Arkham Horror: The Card Game
|
| In the Dread of Night | CT28 | 2009 | Fantasy Flight Games | Call of Cthulhu LCG
|
| In the Shadows | CHA2357 | 1995 | Chaosium | Call of Cthulhu (Classic)
|
| In Too Deep * | AHC53 | 2020 | Fantasy Flight Games | Arkham Horror: The Card Game
|
| In Whom We Trust | | 2016 | Self Published | Call of Cthulhu (Classic)
|
| The Incriminating Letter | | 2003 | Self Published | Call of Cthulhu (Classic)
|
| Indigo: After the End of the World | | Feb 2018 | Chaosium | Call of Cthulhu (Now)
|
 Infest | | n/a | Self Published | Call of Cthulhu (Now)
|
| Infinite Gulfs of Darkness | | 2021 | Ludonova | Arkham Noir
|
| Inheritance | FS03 | 2007 | Self Published | Call of Cthulhu (Rising)
|
| Inheritance | | 2019 | Chaosium | Call of Cthulhu (Classic)
|
| Initiations of the Favored | CT42 | 2011 | Fantasy Flight Games | Call of Cthulhu LCG
|
| Inncommers | | 2016 | Xipe Totec Press | Call of Cthulhu (Now)
, Cthulhu Dark
, Delta Green
, Trail of Cthulhu
|
| An Inner Call | | Sep 2020 | Chaosium | Call of Cthulhu (Classic)
|
| An Inner Darkness | GGP2001 | 2020 | Golden Goblin Press | Call of Cthulhu (Classic)
|
| The Innsmouth Conspiracy * | AHC52 | 2020 | Fantasy Flight Games | Arkham Horror: The Card Game
|
| Innsmouth Escape | TLC3401 | 2008 | Twilight Creations | Innsmouth Escape
|
| Innsmouth Horror Expansion | VA57 | 2009 | Fantasy Flight Games | Arkham Horror
|
| The Innsmouth Lighthouse | | 2009 | Self Published | Risus
|
 Inperium Romanum | CHA23115map | 2009 | Chaosium | Call of Cthulhu (Invictus)
|
| Insanitarium | | 2019 | Chaosium | Call of Cthulhu (Classic)
|
| Intellect Devourer | 1 | 1987 | Self Published | Call of Cthulhu (Classic)
|
| Intellect Devourer | 7 | Jun 1988 | Self Published | Call of Cthulhu (Now)
|
| Interface | 6 | 1992 | Prometheus Publishing | Call of Cthulhu (Cyberpunk)
|
| Interface 19.40 | MUH050027AC | 2015 | Modiphius Entertainment | Call of Cthulhu (Achtung!)
, Interface Zero
, Savage Worlds (Achtung!)
|
| Interregnum | 30 | May 1999 | Self Published | Call of Cthulhu (Classic)
|
| Intersections | | 2016 | Xipe Totec Press | Call of Cthulhu (Now)
, Cthulhu Dark
, Delta Green
, Trail of Cthulhu
|
| Into a Dark Heart | | Aug 2021 | Chaosium | Call of Cthulhu (Classic)
|
| Into Tartarus | CT51 | 2011 | Fantasy Flight Games | Call of Cthulhu LCG
|
| The Intruder Within | | n/a | Self Published | Call of Cthulhu (Classic)
|
| Invasive Procedures | PELG09 | 2011 | Pelgrane Press | Trail of Cthulhu
|
| Investigator Expansion Pack | | 2020 | Purple Meeple Games | Cultistorm
|
| Investigator Mug Set | CHA9303 | n/a | Chaosium | None
|
| Investigator Passports | | 2019 | base113 Games | Call of Cthulhu (Classic)
, Trail of Cthulhu
|
| Investigator Promo Cards * | | 2017 | Fantasy Flight Games | Elder Sign
|
| Investigator Sheets | CHA5111 | 1993 | Chaosium | Call of Cthulhu (Classic)
|
| Investigator Weapons Volume 1: The 1920s and 1930s | 60-IHB01 | 2012 | Sixtystone Press | Call of Cthulhu (Classic)
|
| Investigator Weapons Volume 2: Modern Day | 60-IHB02 | 2015 | Sixtystone Press | Call of Cthulhu (Now)
|
| Investigators | | 2019 | Petersen Games | Cthulhu Wars
|
| Investigator's Guide to the Secret War | MPS01031CS | 2013 | Modiphius Entertainment | Call of Cthulhu (Achtung!)
, Savage Worlds (Achtung!)
|
| Investigator's Guide to the Secret War * | MUH51740 | 2019 | Modiphius Entertainment | |
| Investigator's Handbook | CHA23136 | 2015 | Chaosium | Call of Cthulhu (Classic)
|
| Investigators Kit * | CHA5102 | n/a | Chaosium | Call of Cthulhu (Classic)
|
| The Investigators of Arkham Horror * | NAHCE1 | 2016 | Fantasy Flight Games | Arkham Horror: The Card Game
|
| Investigators of horrors! | | Oct 2019 | Chaosium | Call of Cthulhu (Classic)
|
| An Invitation in Yellow | | Feb 2018 | Chaosium | Call of Cthulhu (Classic)
|
| Ira Incensa | | Mar 2021 | Chaosium | Call of Cthulhu (Classic)
|
| Ire of the Void * | NAH12 | 2017 | Fantasy Flight Games | Arkham Horror: The Card Game
|
| Irrational Express * | | 2003 | Self Published | Call of Cthulhu (Classic)
|
| The Island * | SKP01110 | 2011 | Skirmisher Publishing | Call of Cthulhu (Classic)
|
| Island 256 | | May 2019 | Chaosium | Call of Cthulhu (WWII)
|
| The Island of Ignorance | GGP1301 | 2013 | Golden Goblin Press | Call of Cthulhu (Classic)
|
| Isle of Madness | | Dec 2017 | Chaosium | Call of Cthulhu (Classic)
|
| It Came From Cthulhu | | 2012 | Planet Pulp Productions | Pulp Adventure
|
| It Came from the Wild Blue Yonder | | 2010 | Self Published | It Came from the Wild Blue Yonder
|
| The Ithaqua Cycle | CHA6021 | 1998 | Chaosium | Call of Cthulhu (Classic)
|
| The Itinerant Hotel | | May 2021 | Chaosium | Call of Cthulhu (Classic)
|