Micklethwait is a surname. Notable people with the surname include:
Frances Micklethwait (1867–1950), English chemist Frederick Micklethwait (1817–1878), English lawyer and cricketer John Micklethwait (born 1962), British journalist Sotherton Micklethwait (1823–1889), English Anglican priest and cricketer William Micklethwait (1885–1947), English cricketer
See also Micklethwait baronets