| Don Hasenmayer | |
| Position: | Third baseman/Second baseman |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 4 April 1927 |
| Birth Place: | Roslyn, Pennsylvania |
| Death Place: | Warrington, Pennsylvania |
| Debutleague: | MLB |
| Debutdate: | May 2 |
| Debutyear: | 1945 |
| Debutteam: | Philadelphia Phillies |
| Finalleague: | MLB |
| Finaldate: | September 29 |
| Finalyear: | 1946 |
| Finalteam: | Philadelphia Phillies |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .100 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 1 |
| Teams: | |
Donald Irvin Hasenmayer (April 4, 1927 – January 28, 2020) was an American professional baseball player. He was an infielder over parts of two seasons (1945–46) with the Philadelphia Phillies. For his career, he compiled a .100 batting average in 30 at-bats, with one run batted in. He was born in Roslyn, Pennsylvania and attended Abington Senior High School. He was a navy veteran of World War II.[1] [2] Hasenmayer died on January 28, 2020.[3]