Longfield is an English surname. Notable people with the surname include:
Anne Longfield, Baroness Longfield (born 1960), former Children's Commissioner for England Chuck Longfield (born 1956), American philanthropist and non-profit sector expert Cynthia Longfield (1896–1991), Irish entomologist and explorer Geoffrey Longfield (1909–1943), English cricketer and Royal Air Force officer John Longfield (1805–1889), Irish officer in the British Army Judi Longfield (born 1947), Canadian politician Lloyd Longfield (born 1956), Canadian politician Mountifort Longfield (1802–1884), Irish lawyer and economist Richard Longfield (1802–1889), Irish politician Richard Longfield, 1st Viscount Longueville (1734–1811), Irish politician Robert Longfield, American composer
Sarah Longfield (born 1994), American musician and YouTuber Tom Longfield (1906–1981), English cricketer Zoe Longfield (1924–2013), American artist