| P. J. McMahon | |
| Birth Date: | 1877 |
| Birth Place: | Windsor, Vermont, U.S. |
| Death Place: | Chester, Vermont, U.S. |
| Alma Mater: | Penn Dental (DDS, 1900) |
| Player Years1: | 1898–1899 |
| Player Team1: | Penn |
| Player Positions: | End |
| Coach Years1: | 1901 |
| Coach Team1: | Vermont |
| Overall Record: | 5–5–1 |
Philip John McMahon (1877 – April 15, 1913) was an American college football player, coach, and dentist. He was a 1900 graduate of the University of Pennsylvania School of Dental Medicine.[1] While there, he lettered in football during the 1898 football season.[2] McMahon served as the head football coach at the University of Vermont for one season in 1901, compiling a record of 5–5–1.