| Leonhard Kass | |
| Fullname: | Leonhard Heinrich Kass |
| Birth Date: | 1911 10, df=yes |
| Birth Place: | Tallinn, Estonia |
| Death Place: | Tallinn, Estonia |
| Position: | Winger |
| Youthyears1: | 1927– |
| Youthclubs1: | Hõimla |
| Years1: | 1931–1934 |
| Years2: | 1936 |
| Years3: | 1939–1940 |
| Clubs3: | Estonia |
| Years4: | 1943 |
| Years5: | 1945–1951 |
| Clubs5: | Dünamo |
| Totalcaps: | ? |
| Totalgoals: | 36 |
| Nationalyears1: | 1931–1940 |
| Nationalcaps1: | 40 |
| Nationalgoals1: | 8 |
| Nationalteam1: | Estonia |
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.[1]
Internationally, Kass made 40 appearances for the Estonia national football team since his debut in 1931, and scored 8 goals.[2] He won the 1931 and the 1938 Baltic Cup with the team.[1]