Bill Hallahan was 3-1 with an ERA of 1.36, 27 strikeouts and 1 save in 7 appearances in the World Series in his career.
| NAME | DATE | SEASON | SERIES | TM | OPP | DEC | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | B. Hallahan | 10/6/1926 | 1926 | World Series |  SLN | vs |  NYY | 0 | 4.50 | 1 | 0 | 0 | 0 | 2.0 | 2 | 1 | 1 | 0 | 3 | 0 | 0 | 0 | 11 | 0 | |
| 2 | | B. Hallahan | 10/4/1930 | 1930 | World Series | SLN | vs |  PHA | W | 1 | 0.00 | 6 | 1 | 1 | 0 | 9.0 | 7 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 38 | 0 |
| 3 | | B. Hallahan | 10/8/1930 | 1930 | World Series | SLN | @ | PHA | L | 1 | 9.00 | 2 | 0 | 0 | 0 | 2.0 | 2 | 2 | 2 | 0 | 3 | 1 | 0 | 0 | 12 | 0 |
| 4 | | B. Hallahan | 10/2/1931 | 1931 | World Series | SLN | vs | PHA | W | 1 | 0.00 | 8 | 1 | 1 | 0 | 9.0 | 3 | 0 | 0 | 0 | 7 | 0 | 0 | 1 | 37 | 1 |
| 5 | | B. Hallahan | 10/7/1931 | 1931 | World Series | SLN | @ | PHA | W | 1 | 1.00 | 4 | 1 | 0 | 0 | 9.0 | 9 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 36 | 0 |
| 6 | | B. Hallahan | 10/10/1931 | 1931 | World Series | SLN | vs | PHA | 0 | 0.00 | 0 | 0 | 0 | 1 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | |
| 7 | | B. Hallahan | 10/4/1934 | 1934 | World Series | SLN | @ |  DET | 1 | 2.16 | 6 | 0 | 0 | 0 | 8.1 | 6 | 2 | 2 | 0 | 4 | 0 | 0 | 0 | 37 | 0 | |
| Total | 5 | 1.36 | 27 | 3 | 2 | 1 | 39.2 | 29 | 6 | 6 | 0 | 23 | 1 | 1 | 1 | 172 | 1 |
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