Postel is a surname, and may refer to:
- Guillaume Postel (1510–1581), French linguist, astronomer, Cabbalist, diplomat, and religious universalist
- Christian Heinrich Postel (1658–1705), German jurist, epic poet and opera librettist
- Georg-Wilhelm Postel, a World War II German general
- Gert Postel, a German impostor
- Jon Postel, an Internet pioneer
- Kaitlynne Postel, a competitor for Miss America 2008
- Sandra Postel, founder of the Global Water Policy Project
Postel is also a village in the Mol municipality in Belgium, the location of Postel Abbey.