- "Skids" O'Toole
- 'Umr At-Tawil
- 'Ymnar
- A. R. Tilburne
- A Colder War
- A Dream of Blood
- A Reminiscence of Dr. Samuel Johnson
- A Study in Emerald
- Aartna
- Abbith
- Abdul
- Abdul Alhazred
- Aberration
- Abholos
- Abhoth
- Abigail Prinn
- Aboleth
- Abraham Merritt
- Abyss
- Abyss of Yhe
- Achtung! Cthulhu (Role-Playing Game)
- Adaedu
- Adolphe de Castro
- Adumbrali
- Afterlife with Archie
- Agnes Baker
- Aihai
- Aiueb Gnshal
- Akachi Onyele
- Aklo
- Aklo language
- Alala
- Alan Moore's The Courtyard
- Albert Wilmarth
- Albino Penguin
- Albino penguin
- Aldebaran
- Alert
- Algol
- Alhazred
- Alice Liddle
- Alice in Wonderland
- Alien Intelligence
- Alioth
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- Altuan
- Altuas
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- Amaterasu
- Ambrose Bierce
- Ammutseba
- Amon-Gorloth
- Among the pictures are these:
- An Age Undreamed Of
- An H.P. Lovecraft encyclopedia
- An H. P. Lovecraft Encyclopedia
- Ancient One (Lovecraft & Lumley)
- And Here There Be -- Demons!
- Angel
- Angell
- Angerboda
- Angstrom
- Animus
- Anna Helen Crofts
- Annie Knowby
- Ansky S.
- Anti-Monitor
- Anti-Spiral
- Aphoom-Zhah
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- Apollo
- Arachnitect
- Arkham
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- Arkham Horror: The Card Game
- Arkham Horror Fiction
- Arkham Horror Premium Figures
- Arkham Horror Second Edition
- Arkham Horror Second Edition Core Set
- Arkham House
- Arkya
- Armageddon
- Army of Darkness
- Army of Darkness/Xena: Forever... And A Day
- Army of Darkness/Xena: Why Not?
- Army of Darkness: Ash Gets Hitched
- Army of Darkness: Ash Vs. The Classic Monsters
- Army of Darkness: From the Ashes
- Army of Darkness: Furious Road
- Army of Darkness (comics)
- Army of Darkness Vol 3
- Army of Darkness Vs. Hack / Slash
- Army of Darkness Vs. Re-Animator
- Arwassa
- Ascent into Hell
- Asenath Waite
- Ash Williams
- Ash and the Army of Darkness
- Ash and the League of Light
- Ashes
- Ashley K. Williams
- Asteroth
- AtMoM
- At the Altar of the Goat God
- At the Mountains of Madness
- Atal
- Atlach-Nacha
- Atlantis
- Atwood
- Aucturn
- August Derleth
- Auton
- Avatar
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- Averoigne
- Ayi'ig
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- Azathi
- Azathoth
- Azathoth (character)
- Azathoth (deity)
- Azathoth (short story)
- Azi Dahaka
- Azotharoth
- B'Moth
- B'gnu-Thun
- Baharna
- Baoht Z'uqqa-mogg
- Barnabas Marsh
- Basatan
- Basil Elton
- Bast
- Bat-Winged Devils
- Before the Storm
- Beholder
- Bel Yarnak
- Belasco
- Bettie Page
- Beyond Wonderland
- Beyond the Wall of Sleep
- Beyond the Wall of Sleep (collection)
- Bhlemphroim
- Bhutan
- Bimini Islands
- Biological experiment
- Birth of Madness
- Black Book of Azathoth
- Black Buddha
- Black Galaxy
- Black Galley
- Black Lotus
- Black Man
- Black Mirror
- Blade Vol 5
- Blessed of Shub-Niggurath
- Blind Idiot God
- Blood Brigade
- Blood Feud
- Bnazic desert
- Bodhisattva
- Bokrug
- Book of Azathoth
- Book of Eibon
- Book of Ending
- Book of Iod
- Book of K'yog
- Book of Thoth
- Books of Thoth
- Boris Hurtta
- Born Again?
- Botsu
- Bouda
- Brad Hollins
- Brethren Moon
- Brian Lumley
- Brian McNaughton
- Brian Stableford
- Bride of Slorioth
- Broken Moon: Legends of the Deep
- Brood
- Brood of Ubbo-Sathla
- Broodling of Chthon
- Broodling of Eihort
- Brotherhood of Sahb Delanzar
- Brotherhood of the Beast
- Brotherhood of the Black Lotus
- Brotherhood of the Black Pharaoh
- Brotherhood of the Skin
- Brotherhood of the Yellow Sign
- Brown Jenkin
- Bubble creature
- Bubbles
- Bugg-Shash
- Buopoth
- Byagoona
- Byakhee
- Byatis
- Bärkatlànm
- C'thalpa
- C. L. Moore
- Cabot Museum
- Calie Liddle
- Call of Cthulhu, Cthulhu Rising
- Call of Cthulhu, End Time
- Call of Cthulhu, The Cruel Empire of Tsan Chan
- Call of Cthulhu: Dark Corners of the Earth
- Call of Cthulhu (Role-Playing Game)
- Call of Wonderland
- Camarilla of the N'Garai
- Cancerverse
- Captain Abraham Whipple
- Carcosa
- Cards of Cthulhu, A Deck Building Game
- Carl Sanford
- Carnivorous fish
- Carsai the King
- Cassandra Hack
- Cassilda
- Cast a Deadly Spell
- Castro
- Cat from Saturn
- Cat of Sadoqua
- Caterpillar
- Cave beast
- Celaeno (star)
- Celephaïs
- Celestial
- Celestial Toymaker
- Celestial Toyroom
- Ceph
- Cerberus
- Cgfthgnm'o'th
- Challengers of the Unknown (M'nagalah)
- Chaos
- Chaos Cascade
- Chaos God
- Chaos King
- Chaos Spawn
- Chaos Wastes
- Chaosium
- Charles Dodgson
- Charles le Sorcier
- Charlie Kane
- Chaugnar Faugn
- Cheshire Cat
- Child of Abhoth
- Child of Shugoran
- Child of Tsathoggua
- Child of Y'golonac
- Child of Yog-Sothoth
- Child of the Green God
- Child of the Sphinx
- Children of Arion
- Chimaera
- China
- Chor-Tal
- Chorazos Cult
- Chrysalis Corporation
- Chthon
- Chthonian
- Chthonic Island
- Church of All
- Church of Starry Wisdom
- Chutes and Ladders
- Circle (CthulhuTech)
- Cite book sandbox
- Cite pub test
- City Below the Seas
- Clark Ashton Smith
- Clash of Queens
- Claus Schmidt
- Cloud of Darkness
- Cloudbeast
- Coatlicue
- Cobra Crown
- Coinchenn
- Cold One
- Cold Print (Short Story Collection)
- Coleopteran
- Collapsing Cosmoses
- Collins
- Colour Out of Space
- Commonplace Book
- Comte Antoine de C--
- Comte d'Erlette
- Conan
- Conan: Adventures in an Age Undreamed Of
- Congregation of the Earth Mother
- Conqueror Worm
- Cool Air
- Copyright status of works by H. P. Lovecraft
- Cosmic Abstract
- Cosmic horror
- Cosmicism
- Court of Azathoth
- Crawling Dead
- Crawling One
- Creature Cops: Special Varmint Unit
- Crimson Bat
- Crimson King
- Crom Cruach
- Cronus
- Crypt of Cthulhu
- Cthaat
- Cthaeghya
- Cthugha
- Cthulhi
- Cthulhu
- Cthulhu: Xothic Wars
- CthulhuPunk
- CthulhuTech (Role-Playing Game)
- Cthulhu Dark
- Cthulhu Dark Ages
- Cthulhu Invictus
- Cthulhu Mythos
- Cthulhu Mythos in popular culture
- Cthulhu Tales Vol 1
- Cthulhu Tales Vol 2
- Cthulhu Wars
- Cthulhu sandbox
- Cthylla
- Ctoggha
- Cult of Mhar
- Cult of Sand Bat
- Cult of the Bloated Woman
- Cult of the Darkhold
- Cult of the Third Moon
- Cultes des Goules
- Curse of the Crimson Altar (1968 film)
- Curse of the Mutants
- Cxaxukluth
- Cybil
- Cykranosh
- Cynothoglys
- Cyäegha
- D'endrrah
- D-Void
- Daemon World
- Dagon
- Dagon (Dungeons & Dragons)
- Dagon (Good Omens)
- Dagon (Pathfinder)
- Dagon (short story)
- Dagon and Jill
- Dagon and Other Macabre Tales
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