Sean McEniff (January 1936 – 21 April 2017) was an Irish businessman and Fianna Fáil politician from County Donegal. He was a member of Donegal County Council, representing the Donegal Electoral Area. At the time of his death in 2017, he was the longest serving councillor in Ireland. In 2016, McEniff issued a public statement through his solicitors in which he denied using his political influence to prevent Gardaí investigating the disappearance of Mary Boyle from questioning a suspect.