http://tvtropes.org/pmwiki/pmwiki.php/Main/LovecraftOnFilm

H. P. Lovecraft's stories, despite a (sometimes deserved) reputation for being uncinematic and exposition-heavy, have spawned a surprising number of film adaptations. These run the gamut from clever and respectful tributes to cynical schlock. Few have had any budget to speak of, and none but the most tenuously-linked have attained mainstream success, but all have a certain level of cult cachet.

Feature-Length Adaptations

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The Dunwich Horror (1970). Modernized version, heavy on sex and psychedelia but retaining many elements of the original story. Still, Dean Stockwell's mustache is probably the scariest part of the film. The Horror of the title is represented as a huge red mass of... stage smoke. Also by Haller.

Humanoids From the Deep (1980), an unacknowledged exploitation version of The Shadow Over Innsmouth. Also by Corman.

The Unnamable (1988) and The Unnamable II (1992, subtitled The Statement of Randolph Carter but also known as The Unnamable Returns).

Pulse Pounders (1988). Anthology with one segment based on "The Evil Clergyman," in which Combs and Crampton appear again. Not released until 2002.

The Resurrected (1991). Based on The Case of Charles Dexter Ward. A more faithful adaptation than The Haunted Palace, it retains the story's premise and something of its structure while updating the setting and changing the POV character from a doctor to a PI hired by Ward's (again, mysteriously existent) wife. The climactic investigation of Ward/Curwen's subterranean laboratory hews surprisingly close to the original, and is almost as chilling. Also known as Shatterbrain. Director Dan O'Bannon's original cut, never released, was titled The Ancestor.

Necronomicon (1993). Anthology with segments that are titled The Rats in the Walls (only with no rats or cannibalism), "Cool Air" (only with lots of sex), and The Whisperer in Darkness (only with neither Mi-Go nor the hills of Vermont; some viewers have suggested that it is actually an adaptation of a different Lovecraft story, "The Nameless City"). The frame story stars Jeffrey Combs, in heavy prosthetic makeup, as Lovecraft himself. The "Cool Air" segment stars a very cash-strapped David Warner.

Lurking Fear (1994). Semi-faithful but rather flat modernized adaptation, most notable for containing Combs's sixth Lovecraftian role: he plays the drunken doctor, a character absent from the original story. (A shortened cut of this film was incorporated into the 2004 anthology Tomb of Terror.)

Castle Freak (1995). Based on The Outsider. Combs and Crampton reunite with Stuart Gordon.

Bleeders (1997). Based on The Lurking Fear. Also known as Hemoglobin.

Cool Air (1999) starring Jack Donner. In a similar vein to the HPLHS's films, this 45-minute black and white adaptation was deliberately made to have the look and feel of a 1930s talkie. In an interesting bit of artistic license, the previously unnamed protagonist has become none other than Randolph Carter. Due to the sheer brevity of the source material, this movie was a case of Adaptation Expansion. It greatly fleshed out the personalties of the main characters, but remained otherwise faithful to the original story and is generally well-regarded among fans.

Dagon (2001). Based mostly on The Shadow Over Innsmouth, modernized and moved to Spain. (The town of Innsmouth becomes Imboca.) The Deep Ones are more octopodean than piscine, possibly as a concession to popular perception of Lovecraft's mythos. Moreover, the movie features a summoning of "Dagon" (as a tentacled, toothy, octopoid monster, not as a giant Deep One) as its climax, something which didn't happen in the original story, and adds a female love interest for the young male protagonist to rescue, treating the viewers to a scene of full frontal female nudity when she is about to be sacrificed to Dagon. Directed by Stuart Gordon.

Cthulhu (2007). Actually based on The Shadow Over Innsmouth, moved to the Pacific Northwest and making the main character gay. The director and writer stated that they were using the story as a metaphor for being gay, and later admitted not having much respect for horror, including Lovecraft, when they first started working on the film.

The Tomb (2007). Virtually unwatchable film with no organic connection to the short story. Seems like a very confused ripoff of Saw, but it's hard to be sure even of that: poor sound recording renders much of the dialogue incomprehensible.

According to IMDB , a version of The Whisperer in Darkness was made in 2007.

, a version of The Whisperer in Darkness was made in 2007. Beyond the Dunwich Horror (2008).

The Dunwich Horror. Premiered on Syfy in October 2009 (so you know it's good). No relation to the preceding. Stars Jeffrey Combs as Wilbur Whateley; Dean Stockwell, who played Wilbur in the 1970 version, also has a role.

Pickman's Muse (2009) Based on "Haunter of the Dark", and not "Pickman's Model" as the title might imply. An artist, Robert Pickman, becomes obsessed by visions of unworldly horror, revealed to him through an ancient artifact discovered in an abandoned church. Starring Barret Walz; directed by Robert Cappelletto. Winner of the Brown Jenkin award, for Best Adaptation, at the 2009 H.P. Lovecraft Film Festival.

The Whisperer in Darkness (2011). The HP Lovecraft Historical Society's followup to the above-mentioned The Call of Cthulhu, based on a similar conceit; however, rather than being a silent film, this movie, in fitting with the original story's publication date of 1931, is a talkie. Rather than a straight adaptation, like the previous film, this one is more of an expanded adaptation. It depicts the events of the book, but where the book ends with the protagonists' flight from Akeley's farm and back home, the movie goes on to have him thwart a ritual preceding an Alien Invasion by the Mi-Go, and fight them in a mid-air combat scene. Since the ending is no less Lovecraftian for it, general consensus is that the movie is, again, a loyal adaptation of the Mythos to film. Available on DVD.

Short Film and Television Adaptations

"Pickman's Model" and "Cool Air" (both 1971). Segments from the second season of Night Gallery. Both add love stories that aren't in the originals, but if you can get past that and the low production values that come with the territory of 1970s television, they're pretty good.

"Pickman's Model" (1981). Short film made by Cathy Welch. It also contains a love interest, with the narrative being a story of previous events related to said love interest. While low-budget, the film is shot in black and white and is very atmospheric, capturing Lovecraft's mood well.

Out of Mind: The Stories of H.P. Lovecraft (1998). A 60-minute Canadian film that mixes many stories of Lovecraft in a new story about a late 20th century man called Randolph Carter (of course) who receives a book from a great-uncle who died before he was born and who starts visiting his great-uncle's memories in his dreams. While taking liberties with Lovecraft's stories, the movie tries to remain faithful to their themes and atmosphere. Includes elements from Herbert WestReanimator, "The Case of Charles Dexter Ward" and "The Statement of Randolph Carter". Christopher Heyerdahl as Lovecraft makes an appearance, being visited by a dreaming Randolph Carter, wearing a shirt with his face on it.

Dreams in the Witch House (2005). An adaptation made by Stuart Gordon of the story of the same name for the Masters of Horror series. Pretty loyal to the source material.

Pickman's Model (2007). Chilean TV movie with very little connection to the story. More of a slasher film than a true Lovecraft adaptation.

Escape from Midwich Valley (2014). A music video for a song by Carpenter Brut. A loose adaptation of "The Shadow Over Innsmouth", in which a woman visits the sinister port town and is confronted with a mystery from her past. Viewable on YouTube.

The Music of Erich Zann (2016), a short film that notably expands the story to make Erich an Arkham Sanitarium escapee and a Holocaust survivor. Viewable on Youtube.

Films Referencing Lovecraft's Works