Eighneachán Ó hAnnluain was an Irish Sinn Féin politician. He was elected as a Sinn Féin Teachta Dála (TD) at the 1957 general election for the Monaghan constituency. He did not take his seat in the Dáil as Sinn Féin ran on an abstentionist ticket. He was one of four Sinn Féin TDs elected at the 1957 general election, the others were Ruairí Ó Brádaigh, John Joe McGirl and John Joe Rice. He did not contest the 1961 general election.
His brother Fergal O'Hanlon was a member of the Irish Republican Army. His sister Pádraigín Uí Mhurchadha was a Sinn Féin Monaghan town councillor from 1999 to 2009.