Mega Man II is an action-platform video game by Capcom for the Game Boy. It is the second game in the handheld version of the Mega Man series after Mega Man: Dr. Wily's Revenge. It is noteworthy for having been developed by a different company than the rest of the Mega Man titles on the Game Boy.

The game follows Mega Man as he pursues his arch enemy Dr. Wily, whose most recent ploy for world domination involves the theft of an experimental time machine. Mega Man confronts both Wily and a number of enemies from his past, including new and mysterious robot named Quint. Just like other Game Boy games in the series, Mega Man II marries the features of two consecutive NES titles, in this case, Mega Man 2 and Mega Man 3.

As with other games in the series, Mega Man II is a standard side-scrolling platformer that lets the player take control of the hero Mega Man as he traverses stages and defeats various enemies and bosses. The player is able to run, jump, and shoot as in the previous game, but is now able to slide along the ground as well. The outset of the game allows the player to choose among four stages to be completed in any order. Beating the Robot Master boss at the end of the stage allows the player access to its unique weapon for the remainder of the game. These weapons have limited ammunition that can be refilled by picking up items dropped by enemies. Spare energy tanks can be obtained and selected to completely refill the player's health.