Base-on-Balls Allowed is the amount of base-on-balls or walks allowed by a particular pitcher.
| All Time Leaders | |||
|---|---|---|---|
| Span | Player | Total | Notes |
| Career | Nolan Ryan | 2,795 | |
| Season | Amos Rusie | 289 | 1890 |
| Game | Bruno Haas | 16 | June 23, 1915. |
| Game | Bill George | 16 | May 30, 1887 |
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