stealth espionage electronic game series debuted by the Japanese toy and game company Konami in 1998. The game is based on the 1980s Nintendo console classic Metal Gear. Metal Gear Solid is centred on a series of missions undertaken by retired solider Solid Snake. In the first Metal Gear Solid, Snake is deployed to counteract Foxhound, a special forces unit turned terrorist. A cast of endearing characters, both good and evil, interact with Snake throughout the series and serve as the centrepiece for the game's popularity. Metal Gear Solid has several sequels, prequels, a novel, multiple spin-offs, a radio drama, and a series of comic books. Metal Gear Solid is viewed as one of the all-time best games for the Sony Corporation's PlayStation console (PlayStation).

The Metal Gear Solid series focuses on stealth and strategy. Players use a variety of techniques and tools to sneak up on and neutralize enemies, with open combat coming only as a last resort. Firearms and other weaponry are used mainly against the “bosses” at the end of each level, with a great deal of strategy also required for their defeat. Smart game play, developed characters, outstanding voice actors, and a well-written script made Metal Gear Solid the premier stealth action title of its time and set the standard for the genre.

The Metal Gear series includes Metal Gear Solid 2: Sons of Liberty, Metal Gear Solid 3: Snake Eater, Metal Gear Solid: Portable Ops, and Metal Gear Solid 4: Guns of the Patriots. In 2008 Metal Gear Solid Mobile was released for use on cellular telephones.