Brian John Allsop (1935–1989) was an Australian professional rugby league footballer who played in the 1950s and 1960s who played in the New South Wales Rugby League. A wing, Allsop played for two Sydney clubs during his career, 80 matches for the Eastern Suburbs club in the years (1955–1959), and 74 for Manly-Warringah (1960–1964).