William Meschin (sometimes William le Meschin;[1] died between 1130 and 1135) was an Anglo-Norman nobleman and baron. The brother of the earl of Chester, he participated in the First Crusade. After returning to England, he acquired lands from King Henry I of England and by his marriage to an heiress. He built Egremont Castle on one parcel and with his wife funded two religious foundations. After he died, his estates were divided amongst his three daughter's descendants.