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.

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