William de Gruchy (born 10 May 1930) is an Australian former athlete who specialised in sprinting.

A Western Australian athlete, de Gruchy was raised in the Perth suburb of Mount Hawthorn.

[1] De Gruchy studied at both St Patrick's Boys' School and Aquinas College in Perth.

[2] De Gruchy won the national 100 yard sprint title for the only time in 1951, edging three-time champion John Treloar.

[4] At the 1952 WA state championships, de Gruchy ran the 100 yard sprint in a wind assisted 9.6 seconds.