William Gill was born on April 15, 1919 in Montreal, Quebec, Canada. Bill started his soccer career at West Hill High School. He then joined the Westmount junior team and later moved to C. P. Glen Yards.
Bill joined the Montreal Stelco team in 1941. In the 1947 season he won the National Soccer League championship with Stelco.
The 6-1 and 180 lbs goalkeeper had a brilliant 1952 season. During the campaign to win the Dominion Championship, Bill played 500 minutes without letting in a goal. Due to his goalkeeping exploits in helping Stelco win the Dominion Championship in the 1952 season, Bill was awarded the 1952 McLagan Trophy, emblematic of being the most valuable player in Montreal.
In April 1953 Bill joined Montreal Hakoah. The Jewish club reached the 1953 Dominion Championship finals but lost to Westminster Royals.
When Hakoah folded he joined Montreal Sparta and played out his career with that club.