János Wenk (24 April 1894 - 17 October 1962) was a Hungarian water polo player and backstroke swimmer who competed in the 1912 Summer Olympics and in the 1924 Summer Olympics.
At the 1928 tournament, he was a reserve player and did not compete in a match.
In 1912, he also competed in the 100 metre backstroke event, but he was eliminated in the first round.
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