Byatt is a surname. Notable people with the surname include:
- Andy Byatt, English wildlife documentary film producer for the BBC Natural History Unit (NHU) in Bristol
- Anthony Byatt (1928–2014), English writer
- A. S. Byatt, DBE (1936–2023), English novelist, poet and Booker Prize winner
- Dennis Byatt (born 1958), English former football central defender born in Hillingdon
- Horace Byatt (1875–1933), British colonial governor
- Ian Byatt (born 1932), British economist and first director general of Ofwat
- Sharon Byatt, British based actress born in Liverpool, who played Irenee in Carla Lane's Bread
- 22724 Byatt (provisional designation: 1998 SE59), an outer main-belt minor planet