Galaga (ギャラガ, Gyaraga) is a Japanese shoot 'em up arcade game developed and published by Namco Japan and by Midway in North America in 1981. It is the sequel to 1979's Galaxian. The gameplay of Galaga puts the player in control of a spacecraft which is situated at the bottom of the screen, with enemy aliens arriving in formation at the beginning of a stage, either trying to destroy, collide, or capture the spaceship, with the player progressing every time alien forces are vanquished.

Galaga is one of the most commercially and critically successful games from the golden age of arcade video games. The arcade version of it has been ported to many consoles, and it has had several sequels. In 2011, the game celebrated its 30th anniversary with the release of Galaga 30th Collection for iOS.