Articles

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