Waddy is a surname. Notable people with the surname include:
Billy Waddy (1954-2022), former professional American football player Charis Waddy (1909–2004), Australian-born British author, lecturer and Islamic scholar Gar Waddy (Edgar Lloyd Waddy, 1879–1963), Australian cricketer Harriet Waddy (1904–1999), American military officer John Waddy (disambiguation) John Lloyd Waddy (1916–1987), senior officer and aviator in the Royal Australian Air Force (RAAF) Jude Waddy (born 1975), former professional American football player Mick Waddy (Ernest Frederick Waddy, 1880–1958), Australian cricketer and clergyman Nan Waddy (1915–2015), Australian psychiatrist Ray Waddy (born 1956), former American football player Samuel Danks Waddy (1830–1902), English politician Percival Stacy Waddy 1875–1937), Australian cricketer and clergyman