Sir William de Shareshull KB (1289/1290–1370) was an English lawyer and Chief Justice of the King's Bench from 26 October 1350 to 5 July 1361.

In 1331, when he had risen to the rank of king's serjeant, he was appointed with others to assess a tallage in Oxfordshire, Gloucestershire, and Berkshire (25 June).

The following year he was one of the council selected by the king to advise him and was ordered on 11 October to attend the approaching parliament in Scotland for the confirmation of the treaty with Edward Balliol.

On 30 November 1340, Edward III returned from the Low Countries and removed the chancellor, treasurer and other prominent officials, among them Shareshull, on a charge of maladministration.

In the last year of his chief justiceship, he was excommunicated by the Pope for refusing to appear when summoned to answer for a sentence he had delivered against Thomas Lisle, the Bishop of Ely for harbouring a man who had slain a servant of Blanche, Lady Wake.

[2] In 1344 some sailors thought Shareshull (there called Sharford) stayed too long at dinner when he was holding assizes in that town.