四坏球（Base on balls，通常纪录为BB）又称作四坏保送，是棒球运动中的术语，指投手对打击手在被有效击出（包括击入界内或界外接杀）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。
abbr. b.b.
misc. walk base on balls
后来道奇队靠着两个安打和一个四坏球保送而形成满垒。
The Dodgers managed to load the bases with two singles and walk.
四个坏球就允许击球员自由上垒。
To go to first base after the pitcher has thrown four balls.
击球员无失误安全上垒的击球叫安打，击球员在投手投出四个坏球后可自动上垒。
No mistakes hitter batting called security barrier hits hit the players in the pitcher threw four balls after automatic base.
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