Frederick George McBrien (15 June 1888 – 2 July 1938) was an Ontario lawyer and political figure. He represented Toronto Southwest and then Brockton from 1923 to 1934 and Parkdale from 1937 to 1938 in the Legislative Assembly of Ontario as a Conservative member. He died in office at the age of 50. His daughter Muriel was one of the founding co-owners of the Kansas City Royals baseball team along with her husband Ewing Kauffman.