Corball is a ball game played in free fall, in the microgravity volume along the rotation axis of a habitat. It is the best known of the weightless sports and, with weightless gymnastics, the recreation most associated in the popular imagination with growing up in space — enough so that it features in the sales material and in the expectations of prospective emigrants on Earth.

Play takes place in a three-dimensional volume with no floor, no preferred orientation, and no way to change direction except by pushing off a surface or another player. Trajectories are straight until something intervenes, which makes the game geometrically simple and tactically difficult.

Because the playing volume lies close to the axis, residual rotation effects are small but not absent, and long trajectories across the volume bend measurably. Courts are sited and oriented to keep this within tolerances that do not dominate play.

See also human flight and Coriolis soccer, the corresponding sports of the low-gravity and full-gravity regimes.