Westmacott is a British surname. Notable people with the surname include:
- Charles Molloy Westmacott, (c.1788âÂÂ1868), British journalist and author
- Captain Herbert Westmacott, (1952âÂÂ1980), British special forces officer killed in action
- James Sherwood Westmacott, (1823âÂÂ1900), British sculptor
- Mary Westmacott, an alias of Agatha Christie
- Mike Westmacott (1925âÂÂ2012), British mountaineer
- Percy G. B. Westmacott (1830âÂÂ1917), British mechanical engineer
- Sir Peter Westmacott (born 1950), British diplomat
- Sir Richard Westmacott (1775âÂÂ1856), British sculptor
- Richard Westmacott (disambiguation), several people