| Frank Hafner | |
| Position: | Pitcher |
| Bats: | Unknown |
| Throws: | Right |
| Birth Date: | August 14, 1867 |
| Birth Place: | Hannibal, Missouri |
| Death Place: | Hannibal, Missouri |
| Debutleague: | MLB |
| Debutdate: | May 5 |
| Debutteam: | Kansas City Cowboys |
| Finalleague: | MLB |
| Finaldate: | May 10 |
| Finalteam: | Kansas City Cowboys |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 0–2 |
| Stat2label: | Strikeouts |
| Stat2value: | 5 |
| Stat3label: | ERA |
| Stat3value: | 7.00 |
| Teams: |
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Francis R. Hafner (August 14, 1867 in Hannibal, Missouri – March 2, 1957 in Hannibal, Missouri) was a Major League Baseball player. A right-handed pitcher, Hafner started two games for the Kansas City Cowboys of the American Association in May 1888. He pitched a complete game both times, but allowed 23 runs (14 earned) to score, while surrendering two home runs, throwing six wild pitches, and allowing 41 men to reach base safely.
The total of six wild pitches ranked second in the league, and with one hit batsman Hafner tied for fourth in that category as well. He never pitched in the major leagues again, and the Cowboys themselves lasted only one more season before folding.