Three-ball, threeball, 3 ball, or 3-ball may refer to:
Billiards Three-ball, a pool (pocket billiards) game played with three object balls 3 ball, the pool (pocket billiards) ball numbered "3" and colored red 3 ball, the green snooker ball, worth 3 points, normally referred to as "the green" Three-cushion billiards, a pocketless, carom billiards game, sometimes incorrectly referred to as three-ball
Other uses 3-ball, a three-dimensional -ball in mathematics Slang term for three-point field goal, a basketball shot that is worth three points The traditional three-ball symbol for a pawnbroker