Wilfred Beauchamp Legg also known as Billie Legg (3 November 1906 – 15 October 1973) was a South African athlete who competed in the 1928 Summer Olympics.
Legg was born in Robertson, Western Cape. He won the British AAA Championships title in the 100 yards event at the 1928 AAA Championships.
Shortly afterwards he represented South Africa at the 1928 Olympic Games in Amsterdam, Netherlands, where he finished fifth the Olympic 100 metres event. In the 200 metres competition he was eliminated in the semi-finals.
At the 1930 British Empire Games he was a member of the South African relay team which won the bronze medal in the 4ÃÂ110 yards contest as well as in the 4ÃÂ440 yards event. In the 100 yards competition he finished fourth and in the 220 yards contest he was eliminated in the heats.