Dark Fantasy is a literary, artistic, and cinematic subgenre of fantasy that incorporates the disturbing, sinister, and often frightening thematic and visual elements typically associated with horror . It blends conventional fantasy settings and tropes with a grim, existential tone, frequently featuring terrifying monsters, supernatural threats, and apocalyptic storylines. The thematic focus often includes deconstructing common fantasy tropes by exploring the darker implications of magic, creature existence, and societal structures.

A strict definition for Dark Fantasy is often ambiguous, existing in a blurred space between fantasy and horror. The genre emphasizes themes of mortality, extreme emotional and moral conflicts, and tragic or bittersweet outcomes for protagonists. The morality of central characters is a key component, frequently featuring anti-heroes or morally ambiguous figures, a narrative style sometimes told from the perspective of a monster or villain. The term is sometimes used as an alternative to "horror" for supernatural stories that are considered less visceral and more aesthetically or psychologically unsettling.

The aesthetic is designed to establish a permanently creepy and foreboding atmosphere in both its natural and architectural settings. The visual style relies on heavy use of dim lighting, profound shadows, and muted colors contrasted with occasional vivid elements like blood or fire.

Settings are overwhelmingly gloomy, frequently depicted at twilight or midnight under perpetually overcast skies. Environments favor isolation and decay, including dark forests with branches that resemble long, spindly fingers, crumbling ruins, and hushed, foreboding villages. Architectural backdrops often feature severe, monolithic structures like stone castles, fortresses, and citadels with rigid, stoic guards and pale, withdrawn servants. Even transportation is ominous, with large ships often shown rising dramatically out of heavy fog near rough port cities. The visual language incorporates imagery of decay and ill intent. This includes bones, skulls, and full skeletons, alongside macabre accessories like thin, dripping candles and practical yet menacing elements such as iron-wrought lanterns, shackles, and chains. Weapons are frequently depicted as bloodied, reflecting constant, brutal conflict. The natural world is represented by symbolic creatures like corvids (crows and ravens) and venomous animals (snakes and spiders). Magic is visually represented with palpable danger, often cast with visible ill intent or suggesting a terrible price has been paid, appearing alongside potions and cauldrons.

Dark fantasy elapses a broad amount of different fashion genres, but notably plays off of gothic, academia, pirate, and royal aesthetics. This is expressed through dark colors and heavy fabrics, such as wool, tweed, leather, suede, and velvet.