Which Disneyland attraction is a dark ride through a haunted mansion?

The Disneyland attraction that is a dark ride through a haunted mansion is The Haunted Mansion.

Located in New Orleans Square, the attraction carries guests through a supernatural house in Omnimover vehicles called Doom Buggies. Its scenes combine theatrical illusions, Audio-Animatronics, portraits, ghosts and comic horror rather than functioning like a conventional walk-through haunted house.

The project was in development for more than a decade and was among the last attractions begun under Walt Disney's direction. Disneyland's version opened to all guests on August 12, 1969. Imagineers ultimately blended two different creative approaches: one emphasizing eerie atmosphere and another favoring humor and visual gags.

The attraction is often confused with Phantom Manor, which is a related but distinct ride at Disneyland Paris. Disneyland's Haunted Mansion also receives a seasonal Haunted Mansion Holiday overlay inspired by Tim Burton's 1993 film The Nightmare Before Christmas.