| Stefan Semmler | |
| Birth Date: | 5 May 1952 |
| Birth Place: | Zschopau, East Germany[1] |
| Height: | 190 cm |
| Weight: | 93 kg |
| Sport: | Rowing |
| Club: | SC DHfK, Leipzig |
Stefan Semmler (born 5 May 1952) is a retired East German rower. Competing in coxless fours he won Olympic gold medals in 1976 and 1980, as well as four world championships in 1974–1979.