Liddiard or Lidiard is a surname. Notable people with the surname include:
Alan Lidiard (1928–2020), British physicist Dennis Liddiard, American make-up artist Gareth Liddiard (born 1975), Australian musician Rebecca Liddiard (born 1990 or 1991), Canadian actress Victoria Lidiard (1889–1992), British suffragette
See also Lydiard (disambiguation)