Mary Boleyn (c. 1499-July 19 1543), was a member of the famous aristocratic Boleyn family, which enjoyed considerable influence during the early part of the 16th century. Some historians claim that she was the younger sister of Queen Anne Boleyn, but her children, and Anne's daughter, believed Mary was the elder sister, as do most historians today.

Mary was one of the mistresses of King Henry VIII of England and also, allegedly, of his rival, King Francis I of France. She was married twice.