William Pantulf (d. 16 April probably in 1112) was an Anglo-Norman nobleman and Baron of Wem. He was born in Calvados, a region of Normandy, where his family had lived since around 1030. Pantulf held lands in Shropshire following the Norman Conquest of England. A vassal of Roger of Montgomery, the Earl of Shrewsbury, Pantulf was accused of murdering Roger's wife but proved his innocence of the charge by a trial by ordeal.