Mangan is an Irish surname anglicised from the Gaelic Ó Mangáin ‘descendant of Mangán’, originally a byname for someone with a luxuriant head of hair (from mong ‘hair’, ‘mane’), borne by families from Connacht, County Limerick, and Tyrone. It is also a Huguenot name, traced back to immigrants from Metz, and may refer to:

• Andrew Mangan, English footballer
• Colm Mangan, Irish General
• Cyrille Mangan, Cameroonian footballer
• Dan Mangan, Canadian musician
• James Mangan (1929 – 2007), American baseball player
• James Clarence Mangan, Irish poet
• James T. Mangan, author and eccentric
• Joseph Mangan, American aerospace engineer
• Stephen Mangan, English actor