Brian John Allsop (1936–1989) was a rugby league player who played in the New South Wales Rugby League. A wing three-quarter back, Allsop played for two Sydney clubs during his career, 80 matches for the Eastern Suburbs club in the years (1955–59), and 74 for Manly-Warringah (1960–64).
An Eastern Suburbs junior, Allsop made it into the first grade side in 1955, in that season he was the NSWRFL leading try scorer with 18 tries scored in his 17 matches that year. In one match that year against the Parramatta Eels he scored 5 tries. Allsop was a representative of Sydney and NSW. The speedy winger scored a total of 59 tries for Easts before departing for Manly where he scored a further 36 in his time there. He retired at the end of the 1964 season.
- The Encyclopedia of Rugby League players (Alan Whiticker & Glen Hudson)