Mike Mercer (born April 28, 1947) is a Canadian former athlete who competed in shot put.

Mercer attended Oakville Trafalgar High School.

[1] As a specialist in shot put, Mercer won Canada's national championship in 1971 and claimed a bronze medal at the 1971 Pan American Games in Cali, behind Americans Al Feuerbach and Karl Salb.

He also had a fourth-place finish at the 1978 Commonwealth Games and was third at the 1981 Pacific Conference Games.

[2] Mercer became a powerlifter in the 1980s after growing frustrated with athletics and set multiple Canadian records.