Hewlett is a surname. Notable people with the surname include:
Aaron Hewlett (c.1820–1871), the first African-American instructor at Harvard University Addison Hewlett (1912–1989), North Carolina politician and attorney Annie Hewlett (1887–1974), English-Canadian writer and artist Arthur Hewlett (1907–1997), British actor Bill Hewlett (1913–2001), American engineer, co-founder of Hewlett-Packard David Hewlett (born 1968), British-born Canadian actor, writer, director and voice actor Donald Hewlett (1920–2011), British actor Flora Hewlett (1914–1977), American philanthropist Frank Hewlett (1913–1983), American journalist and war correspondent Hilda Hewlett (1864–1943), British aviation pioneer James Hewlett (painter) (1768–1836), English flower painter James Hewlett (actor) (fl.1821–1849), African-American Shakespearean actor James Monroe Hewlett (1868–1941), American Beaux Arts architect, scenic designer, and muralist Jamie Hewlett (born 1968), English comic book artist John Hewlett (1762–1844), English reverend and biblical scholar Joseph Hewlett (1800–1847), English clergyman, schoolmaster and novelist Kate Hewlett (born 1976), Canadian actress Locklan Hewlett, American football player Mark Hewlett (born 1974), Rhodesian-born radio and television personality Martinez Hewlett (born 1942), American biologist Matthew Hewlett (born 1976), English footballer Maurice Hewlett (1861–1923), English historical novelist, poet and essayist Peter Hewlett (born 1941), Zimbabwean farmer and politician Richard Hewlett (American Revolutionary War) (1729–1789), Royalist soldier Richard G. Hewlett (1923–2015), American historian Rosie Hewlett (born 1995), English author Siobhan Hewlett, British-Irish actress Steve Hewlett (journalist) (1958–2017), British journalist Thomas Hewlett (1882–1956), British Conservative Party politician and industrialist Thomas Hewlett, Baron Hewlett (1923–1971), British industrialist Timothy Y. Hewlett (1896–1986), American architect and artist. William Hewlett (regicide), officer in charge of the soldiers at the execution of King Charles I in 1649 W. H. Hewlett (1873–1940), Canadian composer, conductor, and organist