| Birth Date: | 25 February 1958 |
| Birth Place: | Amersfoort, Utrecht, the Netherlands |
| Height: | 1.92m (06.3feet) |
| Weight: | 84kg (185lb) |
| Sport: | Swimming |
| Club: | AZ&PC, Amersfoort |
Peter Willem Drost (born 25 February 1958) is a former freestyle swimmer from the Netherlands, who competed at the 1980 and 1984 Summer Olympics. His best individual result came in 1984, when he finished in seventh place (7:26.72) in the 4×200 m freestyle relay, alongside his younger brother Frank, Hans Kroes and Edsard Schlingemann. He is not related to Monique Drost, who is also a retired swimmer who competed at the 1980 Olympics.