William Parr

• William Parr (died 1483), English courtier and soldier
• William Parr, 1st Baron Parr of Horton, English courtier
• William Parr, 1st Marquess of Northampton, English courtier, brother of Catherine Parr
• William Parr (explorer), Australian explorer
• William Parr (footballer), English footballer
• William Parr (1813 convict), British convict transported to New South Wales in 1813