Thomaz Koch (born 11 May 1945) is a former tennis player from Brazil, who was a quarterfinalist at the French Open, Wimbledon and the U.S. National Championships.

[1] In addition he also won 5 challenger satellite tour tiles towards the end of his career.

[1] He won also two gold medals in the men's tennis competition at the 1967 Pan American Games.

[1] He won his first senior title in 1964 at the Swiss International Championships against compatriot Ronald Barnes.

He won his final main tour title in 1976 at the Malta International against Britain's Roger Taylor.