Haythornthwaite is an English surname, meaning the meadow or clearing in the hawthorn trees. Notable people with this surname include the following:
Ethel Haythornthwaite (1894–1986), British environmentalist and pioneer of the countryside movement Caroline Haythornthwaite, Canadian academic in information sciences Joan Haythorne (born Haythornthwaite), British actress Natalie Haythornthwaite, English netball player Philip Haythornthwaite (born 1951), English military historian Richard Haythornthwaite, British business executive
See also Hawthornthwaite