Ladd is the surname of:

• Alan Ladd (1913–1964), American film actor
• Alan Ladd, Jr. (1937–2022), American film industry executive and producer
• Andrew Ladd (b. 1985), Canadian ice hockey player
• Aspen Ladd (b. 1995), Mixed Martial Arts fighter
• Azel P. Ladd (1811–1854), American educator
• Cheryl Ladd (b. 1951), American actress and singer
• Diane Ladd (b. 1932), American actress
• Donna Ladd (b. 1961), American journalist
• Edwin F. Ladd (1859–1925), American politician
• Ernie Ladd (1938–2007), American football player and wrestler
• George Ladd (Medal of Honor recipient), American Civil War soldier
• George Eldon Ladd (1911–1982), American minister and professor
• George Trumbull Ladd (1842–1921), American philosopher and psychologist
• Herbert W. Ladd (1843–1913), American politician
• Helen Ladd, education economist
• Jean Ladd (1923–2009), All-American Girls Professional Baseball League player
• Jesse A. Ladd (1887–1957), United States military officer
• Jim Ladd (b. 1948), American radio personality
• Jordan Ladd (b. 1975), American actress
• Joseph Onesimus Ladd (1818–1882), founder of Ladd's cordials in Adelaide, South Australia
• Kate Macy Ladd (1863–1945), American philanthropist
• Margaret Ladd (b. 1942), American actress
• Mike Ladd, American musician
• Mike Ladd (poet) (b. 1959), Australian poet
• Pete Ladd (1956–2023), American baseball pitcher
• PJ Ladd (b. 1983), American skateboarder
• William Ladd (1778–1841), American philanthropist and peace advocate
• William S. Ladd (1826–1893), American banker and politician