Comic adaptations of Lovecraft’s works have been around since 1950. For a full treatment of Lovecraftian comics, see Brian Lingard’s H.P. Lovecraft in the Comics. For an analysis of Lovecraftian elements in superhero comics, see Cthulhu in the Comics - Part One: The Superhero Books.

“The Alchemist”, Steve Jones and Octavio Cariello

LOVECRAFT In Full Color, No. 4 (May 1992), 1–24.
The Worlds of H.P. Lovecraft: The Alchemist (1997).

“Beyond the Wall of Sleep”, Steve Jones and Octavio Cariello

LOVECRAFT In Full Color, No. 2 (March 1992), 1–24.
The Worlds of H.P. Lovecraft: Beyond the Wall of Sleep (1998).

“The Call of Cthulhu”, John Coulthart

The Starry Wisdom. London: Creation Books, 1994, 69–100.
The Haunter of the Dark and other Grotesque Visions. Oneiros Books, 2000.

“Cool Air” (as “Baby, It’s Cold Inside”), Ingels and Al Feldstein

Vault of Horror, No. 17 (February–March 1951).

“Cool Air”, M.C.S.

Skull Comics, No. 4 (1972), 21–26.

“Cool Air”, Bernie Wrightson

Creepy, No. 113 (November 1979), 34–40.
Bernie Wrightson: Master of the Macabre, Pacific Comics.

“Dagon”, Steven Philip Jones and Sergio Cariello

The Worlds of H.P. Lovecraft: Dagon, Nos. 1 and 2 (1993).

The Dream-Quest of Unknown Kadath, Jason Thompson

H.P. Lovecraft’s The Dream-Quest of Unknown Kadath, Nos. 1 to 5 (November 1997 to February 1999).

“The Dunwich Horror”, Breccia

Heavy Metal, III, No. 6 (October 1979), 17–24, 74–80.

“The Dunwich Horror”, John Coulthart

The Haunter of the Dark and other Grotesque Visions. Oneiros Books, 2000.

“Facts Concerning the Late Arthur Jermyn and His Family”, Steven Philip Jones and Wayne Reid

The Worlds of H.P. Lovecraft: Arthur Jermyn (1993), 1–24.

“The Festival”, Bruce McCorkindale

Fantasy Empire Presents H.P. Lovecraft (1984), 12–22.

“The Haunter of the Dark”, Ron Goulart, Gene Colan, and Dan Adkins

Journey into Mystery, No. 4 (April 1972), 3–5, 7–8, 10–11, 13–14, 16.

“The Haunter of the Dark”, John Coulthart

The Haunter of the Dark and other Grotesque Visions. Oneiros Books, 2000.

“The Hound”, Jaxon

Skull Comics, No. 4 (1972), 4–12.
Fantasy Empire Presents H.P. Lovecraft (1984), 37–44 (missing one page).

“In the Vault” (as “Fitting Punishment”), Ingels and Al Feldstein

Vault of Horror, No. 16 (December 1950–January 1951).

“The Lurking Fear”, Steve Jones and Octavio Cariello

LOVECRAFT In Full Color, No. 1 (December 1991), 1–24.
The Worlds of H.P. Lovecraft: The Lurking Fear (1997).

“The Music of Erich Zann” (as “The Music from Beyond”), Roy Thomas and Johnny Craig

Chamber of Darkness, No. 5 (June 1970), 12–14, 16–17, 20–21.
Masters of Terror, 1, No. 2 (September 1975), 48–55.

“The Music of Erich Zann”, Steven Philip Jones and Aldin Baroza

The Worlds of H.P. Lovecraft: The Music of Erich Zann (1993).

“Pickman’s Model”, Herb Arnold

Skull Comics, No. 4 (1972), 27–34.

“Pickman’s Model”, Roy Thomas and Tom Palmer

Tower of Shadows, No. 9 (January 1971).
Masters of Terror, 1, No. 2 (September 1975), 56–62.

“The Picture in the House”, Steven Philip Jones and Rob Davis

The Worlds of H.P. Lovecraft: The Picture in the House (1993).

“The Rats in the Walls”, Bob Jenney

Creepy, No. 21 (July 1968).

“The Rats in the Walls”, Richard Corben

Skull Comics, No. 5 (1972), 3–12.

“The Shadow Out of Time” (as “The Shadow from the Abyss”), Todd

Skull Comics, No. 5 (1972), 24–35.

“The Statement of Randolph Carter” (as “The Thing”), Voss

Heavy Metal, III, No. 6 (October 1979), 32–37.

“The Statement of Randolph Carter”, Steven Philip Jones and Chris Jones

The Worlds of H.P. Lovecraft: The Statement of Randolph Carter (1996).

“The Terrible Old Man”, Roy Thomas, Barry Smith, Dan Adkins, and John Verpoorten

Tower of Shadows, No. 3 (January 1970).
Masters of Terror, 1, No. 1 (July 1975), 34–40.

“To a Dreamer”, C. Dallas

Skull Comics, No. 5 (1972), 22–23.

“The Tomb”, Steve Jones and Octavio Cariello

LOVECRAFT In Full Color, No. 3 (April 1992), 1–24.
The Worlds of H.P. Lovecraft: The Tomb (1997).

“The Whisperer in Darkness”, Daryl Hutchinson and Melissa Martin

H.P. Lovecraft’s Cthulhu, No. 1, 8–25.