Leonhard Heinrich Kass (22 October 1911 – 23 November 1985) was an Estonian football player who played as a left winger. He won the Estonian Championship eight times and the Estonian Cup twice.
Internationally, Kass made 40 appearances for the Estonia national football team since his debut in 1931, and scored 8 goals. He won the 1931 and the 1938 Baltic Cup with the team.
Honours Club Sport Estonian Championship: 1931, 1932, 1933
Estonia Estonian Championship: 1938–39
Dünamo Estonian Championship: 1945, 1947, 1949, 1950 Estonian Cup: 1946, 1947
Country Estonia Baltic Cup: 1931, 1938
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