Hanlon is a surname often associated with, but not necessarily tied to, the O'Hanlon Sept. The name may denote:
Alfred Charles Hanlon, New Zealand lawyerDarren Hanlon, Australian folk musicianGeorge Hanlon, British-born acrobat (see Hanlon-Lees)Glen Hanlon, Canadian ice hockey player and coachJohn Hanlon (record producer), American record producer and recording engineerThe Reverend John J. Hanlon, chancellor of the Diocese of AlbanyJohn Hanlon (singer), New Zealand singer-songwriterMichael Hanlon (1964–2016), British science writerNed Hanlon, American baseball managerPhilip J. Hanlon, American mathematician and President of Dartmouth CollegeRichie Hanlon, fictional character from OzRitchie Hanlon, English football player and managerTommy Hanlon Jr, Australian television personality