三杀(Triple play)也称为三杀打或三杀守备，原则来就是双杀打的延伸，主要是在棒球比赛中，一二垒有人或满垒的状态下，在打者击出内野滚地球时，不论是由防守球员自踩垒包、触杀或是以顺时钟依序将球传三垒、二垒、一垒，只要方守人员让进攻方三名跑者全部都在到达下一个垒包之前出局，打者的打击纪录上就会记为三杀打。

三杀可以进行多种方式进行，其中大部分是第一个和第二个垒包有人，将球打到游击手或三垒手，被迫前往三垒而出局，球又被传到二垒形成第二人出局，然后再刺杀前进一垒的跑者。

而三杀守备则是说，垒包上一二垒皆有人时，当打者打出平飞球，通常是被二垒手或游击手给接杀出局，然后二垒手或游击手在二垒往三垒推进的跑者来不及回垒时将其触杀，然后再传往一垒，一垒手接到球后则在对方一垒往二垒跑者回垒不及时将其触杀出局；或者是二垒手直接在完成飞球接杀并触杀回垒不及的二垒往三垒推进的跑者后，再将一垒往二垒推进的跑者直接触杀，也仍构成三杀守备。

In baseball, a triple play (denoted by TP) is the rare act of making three outs during the same continuous play.

There are many ways the defensive team can execute a triple play, most occurring with runners on first and second base. Typically, a ball hit to the shortstop or third baseman is fielded, the runner heading to third is forced out or tagged out, the ball is thrown to second base for a force play, and then finally to first to throw out the batter. Another likely sequence is a line drive to the shortstop or second baseman that is caught without the runners noticing or after they have taken large leads (as in the case of a hit and run), the runners then being forced or tagged out when they fail to tag up.