Peter Wiersum (born 1 November 1984 in Sutton Coldfield) is a Dutch former rowing coxswain. He is a three-time Olympian and won a world championship title in 2007. He competed in the 2007 World Rowing Championships in Munich and steered the Dutch lightweight eights to the World title. He qualified for the 2008 Summer Olympics in Beijing with the Dutch eight made up by Olaf van Andel, Rogier Blink, Jozef Klaassen, Meindert Klem, David Kuiper, Diederik Simon, Olivier Siegelaar and Mitchel Steenman. Due to an injury, Siegelaar was replaced by Reinder Lubbers during the tournament.