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A ball is a round object that is used in sports and games. Balls are usually spherical but can be other shapes, such as ovoid. In most games using balls, the play of the game follows the state of the ball as it is hit, kicked, or thrown by players.

Balls were used in ancient history by the early Egyptians and the ancient Greeks and Romans.

Popular games involving balls include:

 Baseball
 FootBall, or SocceR
 AmericanFootball
 Dodgeball?
 Tennis
 Golf
 Basketball

In modern times balls have been used in machinery. The ball bearing is a device used to reduce the friction of moving parts in a wide variety of machines. Ball bearings use hardened steel balls.