Mario Gyr (born 2 May 1985) is a Swiss rower. He won gold at the 2016 Summer Olympics in the men's lightweight four with Lucas Tramèr, Simon Schürch and Simon Niepmann. The same team, coached by New Zealander Ian Wright, also won this event in the 2015 World Championships. He also competed in the men's lightweight coxless four event at the 2012 Summer Olympics, finishing fifth.