Hennigan is a surname. Notable people with the surname include:
Brian Hennigan, British novelist, producer and directorCharlie Hennigan, known as Charlie Hennigan (born 1935), retired American football playerGilbert Franklin Hennigan (1883–1960), US senator instrumental in the creation of McNeese State University as a four-year collegeJohn Hennigan (politician), Irish politician and farmerJohn Hennigan (poker player), American professional poker player from Philadelphia, PennsylvaniaJohn Morrison (wrestler), (born John Hennigan, 1979), American former professional wrestlerMaura Hennigan, the Clerk Magistrate of the Suffolk County, Massachusetts Superior Court Criminal/Business DivisionMike Hennigan (born 1942), English former professional football player and managerPhil Hennigan (1946–2016), right-handed former Major League Baseball pitcherSean Hennigan, voice actor