William Bowyer (d. 1569/1570) was an antiquary and government official who was a Member of Parliament and Keeper of the Records in the Tower of London early in the reign of Elizabeth I of England. He was the first Keeper to systematically organise and catalogue the store of government records maintained in the Tower. An avid collector of old manuscripts, he also created Heroica Eulogia, a compilation of grants and verse eulogies relating to the earls of Leicester, along with satirical verses and illustrations, for presentation to Robert Dudley, Earl of Leicester.