A stealth game, or simply Stealth, is a video game genre that rewards the player for using stealth to overcome antagonists. Games in the genre typically allow the player to remain undetected by hiding, using disguises, and/or avoiding noise. Some games allow the player to choose between a stealthy approach or directly attacking antagonists, perhaps rewarding the player for greater levels of stealth. The genre has employed espionage, counter-terrorism and rogue themes, with protagonists that have been identified as special forces operatives, spies, thieves, assassins and ninjas. Some games have combined stealth game elements with those of other genres, such as first-person shooters and even platformers.

Some of the early games emphasizing stealth include Castle Wolfenstein (1981), 005 (1981), Metal Gear (1987), and Metal Gear 2: Solid Snake (1990). According to the New York Times, "once upon a time, stealth in games was rare. This began to change in 1998", while Maximum PC has said "Some would argue that the stealth-action genre was born in 1998" with the mainstream success of Metal Gear Solid as well as Tenchu: Stealth Assassins and Thief: The Dark Project. Tenchu was the first 3D game in the genre, while Metal Gear Solid, released some months later, transformed the relatively obscure Metal Gear series into a highly acclaimed, profitable franchise with numerous sequels.Thief: The Dark Project pioneered 3D stealth games on PC. These games were followed by other stealth series, such as Hitman and Splinter Cell. Later games in the genre have allowed the player to choose between, or combine, stealth tactics and direct confrontation.