Bill Millar (born 20 May 1950) is a Canadian former international soccer player.
A defender, Millar played with Toronto City in 1971, and the following season played in the National Soccer League with Hamilton Italo-Canadians. In 1973, he played with league rivals London City. He played with Hamilton City in 1974, and later with Welland Lions Croatia and St. Catharines Roma.
In 2012, he was inducted into the Hamilton Soccer Hall of Fame. In 2014, the Ontario Soccer Association awarded Millar with the Ontario Soccer Meritorious Service Award.
Millar made his debut for the Canada men's national under-23 soccer team on 8 June 1971 against Mexico. He represented Canada in the 1971 Pan American Games. He made his senior debut on 5 August 1973 against the United States in a friendly match.
After playing college soccer with the McMaster Marauders, he became a teacher. He was head coach of the Brock Badgers for 31 seasons until retiring in 2016. In 2019, he was named the head coach for Hamilton United Elite's U15 girl's Ontario Player Development League (OPDL) program.