John Hennigan was an Irish politician and farmer.
He was a member of Sligo County Council from 1920 to 1942.
He was an unsuccessful independent candidate in Sligo–Mayo East at the 1922 general election. He was first elected to Dáil Éireann as a Cumann na nGaedheal Teachta Dála (TD) for Leitrim–Sligo at the 1923 general election. He was re-elected at each subsequent election until he lost his seat at the 1933 general election.
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