Joule is a surname. Notable people with the surname include:
Barry Joule (born 1954/55), Canadian writer James Prescott Joule (1818–1889), physicist and brewer John Joule, chemist Reggie Joule (born 1952), politician
Fictional characters: Yzak Joule, in the anime series Mobile Suit Gundam SEED Joule Adams, in ReCore