| Wilhelm Effern | |
| Nationality: | Dutch |
| Sport: | Middle-distance running |
| Event: | 1500 metres |
| Birth Date: | 21 January 1907 |
| Birth Place: | Vlaardingen, Netherlands |
| Death Place: | IJmuiden, Netherlands |
Wilhelm Fredrik Effern (21 January 1907 - 28 May 1990) was a Dutch middle-distance runner. He competed for the Netherlands in the men's 1500 metres at the 1928 Summer Olympics.[1]