Alf Sadler (1906-1975) was an Australian rugby league footballer who played in the 1930s.

Born in 1906 to Edith May Woolmer and Samuel James Sadler.

Lower grade Five-Eighth/ Halfback, Sadler replaced the injured Jim Flower for the St. George in the 1930 Final and Grand Final.

[2][3][4] Sadler played three first grade games during his career, his debut was against Western Suburbs in Round 4 on 17 May 1930.

Sadler died on 5 July 1975 at Arncliffe, New South Wales.