Sieber may refer to:
- Sieber (river), a river in the Harz mountains of Germany.
- Franz Sieber, botanist
- Christopher Sieber, actor
- Lothar Sieber, test pilot
- Albert Sieber, chief of scouts
- Christoph Sieber, sailor
- Bodo Sieber, German rugby union player
- Michael Sieber, competition canoe paddler