保送率（英语：Walks per Nine Innings），缩写为BB/9， 是一种棒球术语及统计，指投手平均每9局球所投出来的保送。投手可能因为四坏球、故意四坏球、触身球三种保送而使打者上垒。此数值关系到投手的控球精准度，越高代表投手的表现不佳，容易让打者上垒，增加失分风险。
保送率计算公式：
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