Maria Petronella "Puck" Oversloot (May 22, 1914 – January 7, 2009) was a Dutch swimmer.
Together with Marie Braun, she was the top national backstroke and freestyle competitor.
At the 1932 Summer Olympics, Braun was listed for the 4 × 100 m freestyle relay, but fell ill and was replaced by Oversloot.
The team won a silver medal, setting a new European record.
Both Braun and Oversloot qualified for 400 m freestyle semifinals, but because Braun could not participate, Oversloot withdrew from the event, in solidarity.In 1933, Oversloot broke the national record in 100 m backstroke set by Braun and became the national champion.
She won a bronze medal in the same event at the 1934 European Aquatics Championships.She was born and died in Rotterdam.