Frederick William Pirie (February 1, 1893 – October 3, 1956) was an industrialist and political figure in New Brunswick. Born in , New Brunswick, Frederick Pirie represented Victoria County in the Legislative Assembly of New Brunswick as a Liberal member from 1930 to 1945. He served as Minister of Lands and Mines in the province's Executive Council from 1935 to 1945. He went on the represent Victoria-Carleton division in the Senate of Canada from 1945 to 1956. He died in office at the age of 66.