| Frank Mahar | |
| Position: | Outfielder |
| Bats: | Unknown |
| Throws: | Right |
| Birth Date: | 4 December 1878 |
| Birth Place: | Natick, Massachusetts |
| Death Place: | Somerville, Massachusetts |
| Debutleague: | MLB |
| Debutdate: | August 29 |
| Debutyear: | 1902 |
| Debutteam: | Philadelphia Phillies |
| Finalleague: | MLB |
| Finaldate: | August 29 |
| Finalyear: | 1902 |
| Finalteam: | Philadelphia Phillies |
| Statleague: | MLB |
| Stat1label: | Games played |
| Stat1value: | 1 |
| Stat2label: | At bats |
| Stat2value: | 1 |
| Stat3label: | Hits |
| Stat3value: | 0 |
| Teams: | |
Frank Edward Mahar (December 4, 1878 - December 5, 1961), was a Major League Baseball outfielder who played in with the Philadelphia Phillies. Mahar played in 1 game, going hitless in one at bat.
He was born in Natick, Massachusetts and died in Somerville, Massachusetts.