Howlett is a surname. Notable people with the surname include:
Barbara Howlett, Australian fungal plant pathologistDavid J. Howlett, American scholar of religion and contributor to Mormonism: A Historical EncyclopediaDoug Howlett, NZ rugby playerElizabeth Howlett, British politicianEric Howlett, American inventorGary Howlett, Irish international footballerGordon Howlett Dean, Canadian politicianJack Howlett, British mathematician and computer scientistJeffrey Howlett, Australian architectLiam Howlett, British musician with The ProdigyMichael Howlett, American politicianMike Howlett, British musician and producerPhil Howlett, Tongan rugby league playerRobert Howlett (1831-1858), British photographerRoger Howlett (born 1948), English cricketerVirginia Howlett, Canadian designer and painter