Alan Wake's American Nightmare is a standalone expansion to the psychological horror action-adventure game Alan Wake, developed by Remedy Entertainment. The story shifts to an alternate reality where Alan Wake finds himself in a small Arizona town. Here, he faces off against his evil doppelgänger, Mr. Scratch, a murderous entity intent on destroying everything Alan holds dear.

The gameplay involves exploring the town, battling new and familiar supernatural enemies, and uncovering pieces of the narrative through manuscripts and other clues. The expansion introduces new weapons and combat mechanics while maintaining the series' focus on the use of light to combat darkness. The narrative explores themes of duality and reality, offering a more action-oriented experience compared to the original game.