William Walcher (or just Walcher, sometimes Walchere or Walker; died 14 May 1080) is the bishop of Durham from 1071, a Lotharingian, the first non-Englishman to hold that see and an appointee of William the Conqueror following the Harrying of the North.

He is murdered in 1080, which leads William to send an army into Northumbria to harry the region again.