Jan Brzák-Felix (6 April 1912 - 15 July 1988) was a Czechoslovak slalom and sprint canoeist from Prague who competed from the mid-1930s to the early 1950s. Competing in three Summer Olympics, he won three medals in the C-2 1000 m event, including two golds (1936, 1948) and a silver (1952).
Brzák-Felix also won four medals at the ICF Canoe Sprint World Championships with three golds (C-2 1000 m: 1950, C-2 10000 m: 1938, 1950) and one silver (C-2 1000 m: 1938).
He also competed at the Geneva 1949 ICF Canoe Slalom World Championships and earned two silver medals (C-1 team, C-2 team) and two bronze medals (C-1, C-2).
In 1955, Brzák-Felix teamed up with 1936 C-1 1000 m silver medalist Bohuslav Karlík to paddle the 118 miles (189.9 km) of the Vltava from České Budějovice to Prague in 20 hours.