[[quoteright:320:http://static.tvtropes.org/pmwiki/pub/images/infernokitties_9537.jpg]]
[[caption-width-right:320:"Very soon now, everything around you will become dark, and someone will take your hand".]]

A 1980 Italian horror film by Creator/DarioArgento, not to be confused with the novel of the same name.

Rose Elliot, a poetess living in New York, purchases a book from a local antiques dealer. Written by an alchemist known as Varelli, the book explains how the author was comissioned by three evil (and very powerful) witches to construct stately mansions for them, from which they rule over the world with insanity, grief and despair. Realizing that the apartment she now resides in might be the home of Mater Tenebrarum, the Mother of Darkness, Rose writes to her brother Mark, currently studying music in Rome, to warn him of her fears.

Mark returns to New York, and finds that Rose has vanished. Taking up residence in her apartment, Mark tries to piece together the whereabouts of his sister, only to discover that her initial fears were horribly correct.

The second film in a loose trilogy (between ''Film/{{Suspiria}}'' and ''Film/MotherOfTears''), in terms of storytelling ''Inferno'' is the most alien of the three. While ''Suspiria'' walked a thin line between murder mystery and surreal horror, ''Inferno'' dispenses with any sort of narrative structure, instead running on a dream logic that makes no concessions to reality. This has made it extremely polarizing among fans of Argento, and of Italian horror in general. To its credit, many notable fans, including critic Creator/KimNewman, consider it one of the most underrated horror films of the 1980s.
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!! This film provides examples of:

* AlienGeometries: The far out architecture of Rose's apartment (to say nothing of the [[Film/{{Suspiria}} Tanz Akademie]] or the [[Film/MotherOfTears Palazzo Varelli]]) makes more sense when you realize it was designed by a medieval alchemist.
* BigBad: Mater Tenebrarum [[spoiler: who is disguised as the nurse]]
* CatsAreMean: Easily one of the most unintentionally hilarious examples ever comitted to film.
* TheCruella: Kazanian, although considering events earlier in the film, he may be somewhat justified.
* DecoyProtagonist: Several.
* EarlyBirdCameo: [[spoiler: Mater Lachrymarum,]] who serves as the main antagonist in [[spoiler: ''Film/MotherOfTears'']], makes a brief appearance in this film, although played by a different actress.
* EatenAlive: [[spoiler: Kazanian by rats.]]
* EncyclopediaExposita: ''The Three Mothers'', by E. Varelli.
* EnforcedMethodActing: Leigh Mc Closkey was forced to do his own stunts during the firey climax, as his stunt double had broken a leg.
* GainaxEnding: More "Gainax Entire Film." Between the insane colors and architecture, good luck figuring out what's happening at any given time. It does, however, look very cool.
* HellHotel: Apartment, but the principal is the same.
* TheButlerDidIt: [[spoiler: Subverted, though it's implied not for lack of trying.]]
* TheFaceless: In contrast to Suspiria, where [[spoiler: the entire faculty belongs to the coven]], the faces of Tenebrarum's coven and servants are appropriately masked by shadow at all times.
* FailureHero: Unlike Suzy in Suspiria, Mark had done nothing to contribute to the villains's defeat. Tenebrarum died in the fire that she had unintentionally caused on her own through one of her murders.
* TheHecateSisters: The Three Mothers.
* NeverFoundTheBody: [[spoiler: Every last death other than Varelli's.]] This is partly what leads to the titular inferno. [[spoiler: It's entirely possible that Mother of Shadows does not die at all, as her guise as Death simply vanishes amid flames.]]
* PinballProtagonist: Played straight, but arguably proof that [[TropesAreTools Tropes Are Not Bad]]. [[spoiler: Mark]] survived and may have played a role in the death of Mater Tenebrarum, but even at the end has little more than faint hints as to what happened.
* PopStarComposer: [[EmersonLakeAndPalmer Keith Emerson]] wrote the music.
* SceneryPorn
* SoundtrackDissonance: Perhaps the best music for sneaking around the BigBad's lair isn't bombastic OminousLatinChanting set to synthesized and up-tempo organ. However, it makes sense in terms of being a key component to support Argento's visual aesthetic.
* SwarmOfRats: [[spoiler: Kazanian encounters these after drowning a sackful of cats. Just desserts, perhaps.]]
* {{Video Nast|ies}}y: Was placed on the list in 1984, was dropped just a year later, and was released uncut in 2010.
* WalkOnWater: After Kazanian falls into the Central Park Lake and is attacked by rats, a hotdog vendor brandishing a knife runs across the lake and finishes him off.
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