Monkey Ball (モンキーボール) is a Sega NAOMI GD-ROM arcade game, originally released in 2001. It is the first game in the Super Monkey Ball series.

The arcade cabinet of Monkey Ball is unique for its banana-shaped joystick. All the bananas in the game are sponsored by Dole, a practise that would carry through to its successor, Super Monkey Ball and Super Monkey Ball 2. There are three characters, AiAi, MeeMee and Baby, three difficulty levels and numerous puzzles to complete.

Monkey Ball was somewhat unique at the time of release. Though marble/ball rolling games had been done in the past, such as Marble Madness, these types of games are fairly rare, and none had ever been presented in 3D.

Monkey Ball itself was not ported to consoles. Instead, an upgraded version titled Super Monkey Ball was released for the GameCube a few months later. It contains all the levels seen in Monkey Ball, plus enhanced graphics and extra features.