Marek Petrusewicz (22 February 1934 – 3 October 1992) was a Polish swimmer who won a silver medal in the 200 m breaststroke at the 1954 European Aquatics Championships.

Nevertheless, he continued competing among disabled athletes in the 1960s, and was active in sport and political life of Poland until the second amputation and a stroke that he suffered in 1986.

He quickly became a top breaststroke swimmer, fully utilizing the then allowed technique of long underwater gliding without resurfacing.

The inevitable prospects of amputation resulted in alcoholism, which could not be helped by his elder brother Stanisław and rehabilitation clinics.

A movie (Rekord świata – World record) was filmed by Filip Bajon based on his swimming career.

He received a master's degree with a thesis on the Movement and the ideology of fascism in Italy and Germany (Polish: Ruch i ideologia faszystowska we Włoszech i Niemczech).