Q-ball or Q Ball may refer to:
- Q-ball, a hypothetical form of matter (namely, a non-topological soliton), in theoretical physics
- Q Ball, the nickname of the dynamic pressure (Q) sensor module in the Apollo spacecraft launch escape system
- Q-ball, a slang term for the drug quetiapine
- QBall (real name Nickolas Wildstar), an American rapper
- Cue ball, the ball struck with the cue stick in billiards, pool, snooker, and other cue sports
- Cueball Carmichael, American professional wrestler, trainer and promoter
| This disambiguation page lists articles associated with the title Q-ball.
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