William Pitt

• William Pitt, 1st Earl of Chatham, William Pitt the Elder, British prime minister
• William Pitt the Younger, son of the above and British prime minister

Arts and entertainment

• William Pitt (Mormon), English bandleader and religious musician
• Brad Pitt, American actor
• William Pitt (singer), American singer

Law and politics

• William Pitt (courtier), English courtier and politician who sat in the House of Commons
• William Morton Pitt, British politician and MP for Poole and Dorset
• William Pitt Murray, American lawyer and politician
• Bill Pitt (politician), British politician and MP for Croydon North West

Nobility

• William Pitt Kalanimoku, Hawaiian noble, high chief to King Kamehameha I
• William Pitt Amherst, 1st Earl Amherst, British Governor-General of India
• William Pitt Leleiohoku I, Hawaiian noble, son of Kalanimoku
• John William Pitt Kinau, prince of Hawaii and son of Leleiohoku I
• William Pitt Leleiohoku II, Crown Prince of Hawaii

Sports

• William Pitt (cricketer), English cricketer
• Bill Pitt (racing driver), Australian racing driver and motor racing official
• William Fox-Pitt, English equestrian

Others

• William Augustus Pitt, British army general
• William Pitt (ship-builder), English ship-builder
• William Pitt (engineer), Canadian inventor of the underwater cable ferry
• William Pitt (architect), Australian architect
• William Baker Pitt, English clergyman
• William Rivers Pitt, American essayist and activist