| William | |
| Margrave of the Nordmark | |
| Tenure: | 1051–1056 |
| Death Date: | 10 September 1056 |
| Death Place: | Pritzlawa |
| Father: | Bernard, Margrave of the Nordmark |
William (died 10 September 1056) was the Margrave of the Nordmark from 1051 until his death. He was the eldest son and successor of the Margrave Bernard by a daughter of Vladimir the Great. He died fighting the Slavs in the Battle of Pritzlawa. Upon his death, he was succeeded by his half-brother Otto as Margrave of the Nordmark.