William Edgar Hazlett (8 November 1905 – 13 April 1978) was a New Zealand rugby union player, farmer, racehorse owner and breeder.

[1] A loose forward, Hazlett represented Southland at a provincial level, and was a member of the New Zealand national side, the All Blacks, from 1926 to 1930.

[2] Hazlett was involved in horse racing from an early age, and in later years was far better known through this part of his life than for his rugby exploits.

Although he won all of New Zealand's top jumping races, his most notable feat was winning the iconic Great Western Steeplechase at Riverton no fewer than 16 times.

A successful dog trialist, Hazlett collapsed and died while competing near Gore on 13 April 1978.