Westmacott is a British surname. Notable people with the surname include:
Charles Molloy Westmacott, (c.1788–1868), British journalist and author Captain Herbert Westmacott, (1952–1980), British special forces officer killed in action James Sherwood Westmacott, (1823–1900), British sculptor Mary Westmacott, an alias of Agatha Christie Mike Westmacott (1925–2012), British mountaineer Percy G. B. Westmacott (1830–1917), British mechanical engineer Sir Peter Westmacott (born 1950), British diplomat Sir Richard Westmacott (1775–1856), British sculptor Richard Westmacott (disambiguation), several people