Metal Gear Solid 3: Snake Eater is a 2004 action-adventure stealth video game developed and published by Konami for the PlayStation 2. It was released in late 2004 in North America and Japan, and in early 2005 in Europe and Australia. It was the fifth Metal Gear game written and directed by Hideo Kojima and serves as a prequel to the entire Metal Gear series. An expanded edition, titled Metal Gear Solid 3: Subsistence, was released in Japan in late 2005, then in North America, Europe and Australia in 2006. A remastered version of the game, Metal Gear Solid 3: Snake Eater - HD Edition, was later included in the Metal Gear Solid HD Collection for the PlayStation 3, Xbox 360, and PlayStation Vita, while a reworked version, titled Metal Gear Solid: Snake Eater 3D, was released for the Nintendo 3DS in 2012. The HD Edition of the game was included on the Metal Gear Solid Master Collection Vol. 1 compilation for Nintendo Switch, PlayStation 4, PlayStation 5, Windows, and Xbox Series X/S on October 24, 2023. The same year, Konami announced a remake, entitled Metal Gear Solid Delta: Snake Eater, for PlayStation 5, Windows, and Xbox Series X/S.

Set in 1964, 31 years before the events of the original Metal Gear, the story centers on the FOX operative codenamed Naked Snake as he attempts to rescue Russian rocket scientist Nikolai Stepanovich Sokolov, sabotage an experimental superweapon, and assassinate his defected former boss. While previous games were set in a primarily urban environment, Snake Eater adopts a 1960s Soviet jungle setting, with the high-tech, near-future trappings of previous Metal Gear Solid games replaced with wilderness. While the environment has changed, the game's focus remains on stealth and infiltration, while retaining the series' self-referential, fourth-wall-breaking sense of humor. The story of Snake Eater is told through numerous cutscenes and radio conversations.

Considered one of the greatest video games of all time, Metal Gear Solid 3 was met with critical acclaim and was a commercial success, having sold more than four million copies worldwide as of March 2010.