List of Famous people named William

Sir William Edward Parry was an Anglo-Welsh explorer of the Arctic best known for his 1819–1820 expedition through the Parry Channel, probably the most successful in the long quest for the Northwest Passage, until it was finally negotiated by Roald Amundsen in 1906.

William Parr, 1st Marquess of Northampton, 1st Earl of Essex, 1st Baron Parr, was the only brother of Queen Catherine Parr, the sixth and final wife of King Henry VIII. He was a "sincere, plain, direct man, not crafty nor involved", whose "delight was music and poetry and his exercise war" who co-authored a treatise on hare coursing. He was in favour with the first two successive Protestant Tudor monarchs, Henry VIII and his son Edward VI, under whom he was the leader of the Protestant party, but having supported the desire of the latter to be succeeded by the Protestant Lady Jane Grey, was attainted by the Catholic Queen Mary, but was restored by her half-sister and Protestant successor Queen Elizabeth I. He married thrice but died without issue.

William Ernest Duncombe, 1st Earl of Feversham, known as The Lord Feversham between 1867 and 1868, was a British Conservative politician.

Admiral William Feilding, 1st Earl of Denbigh was an English naval officer and courtier.