William "Max" Oppy (14 October 1924 – 25 November 2008) was an Australian rules football player who played in the Victorian Football League (VFL) between 1942 and 1954 for the Richmond Football Club. He was senior coach of Richmond in 1956.
Oppy, who was recruited from Kew, started his career as a rover at Richmond and played in their 1943 premiership side. The following season he was pushed into defence by Jack Dyer and soon established a place in the side as a specialist back pocket, participating in a losing Grand Final at the year's end. He represented the VFL at interstate matches four times
After retiring from football in 1954, Oppy returned to Richmond two years later and replaced Alby Pannam as senior coach. They managed just six wins, finishing in tenth position, which meant Oppy wasn't kept on in 1957.
He was the cousin of Dick Reynolds and Tom Reynolds. He was also a cousin of murdered lawyer Keith William Allan.