Alf Fraser nicknamed "Sonny" was an Australian professional rugby league footballer who played in the 1910s and 1920s. He played for Balmain as a second rower but also played as a prop.

Fraser made his debut in 1916 for Balmain against local rivals Glebe. That same year Fraser played in the 1916 NSWRL grand final victory over Souths. Fraser was a part of the 1917, 1919 and 1920 sides which won the premiership but the club did not need to play in a grand final those seasons as in those days an annual grand final was not mandatory.

In 1924, Fraser claimed his fifth premiership as a Balmain player defeating Souths in the grand final 3–0. Fraser retired the following year in 1925. At representative level he played for New South Wales on eight occasions.^[2]