保送是棒球术语。是属于保送让打者上垒的通称。包括四坏球（保送一垒）、和触身球（保送一垒）。

击球员获得四坏球、故意四坏球（敬远球或保送战术），或是投手所投出的球击中击球员（打者）形成触身球，击球员可以直接上到一垒的情形。

四坏球（Base on Balls，通常记录为BB）又称作四坏保送，英文也以Walk为同义词，是棒球运动中的术语，指投手对击球员在被有效击出（包括击入界内或界外置杀）或投出三个好球之前，投出四个坏球，此时打者会被保送上一垒，投手投出四坏保送，会平白给对手在没有安打的情形下制造得分的机会，投出许多保送的投手常代表其控球能力不佳；反过来说，一个选球能力好的打者，能够获得较多四坏球上垒的机会，替球队争取更多得分的机会。

A base on balls (BB), also known as a walk, occurs in baseball when a batter receives four pitches that the umpire calls balls, and is then entitled to reach first base without the possibility of being called out. The base on balls is defined in Section 2.00 of baseball's Official Rules, and further detail is given in 6.08(a). It is considered a faux pas for a professional player to walk to first base; the batter-runner and any advancing runners normally jog on such a play, with Pete Rose earning his nickname "Charlie Hustle" due to him running towards first on a walk.