Fisher Boatworks was boatyard in Detroit, Michigan founded in 1937 by William P. Fisher. The Fisher Boatworks site was first the Russell J. Pouliot Boat Works founded in the 1930s. Fisher Boatworks built many Submarine chaser boats for World War II. They are also known for building one of first Prototype PT boats: PT-3 and PT-3. Fisher Boatworks closed after the war in 1945. The boatyard was on Motor Boat Lane, now the Gregory Marina on the Detroit River of the Waterworks Park.