Conor Alexander Maguire (22 July 1889 – 26 September 1971) was an Irish politician, lawyer and judge who served as Chief Justice of Ireland from 1946 to 1961, a Judge of the Supreme Court from 1946 to 1961, President of the High Court, a Judge of the High Court from 1936 to 1946 and Attorney General of Ireland from March 1932 to November 1932.
He served as a Teachta Dála (TD) for the National University of Ireland from 1932 to 1936.
Born in Castlebar, County Mayo, Maguire was educated at University College Dublin, where he was a founding member of the Legal and Economic Society (now known as the University College Dublin Law Society) in 1911.
He returned to County Mayo where he practised as a barrister and was instrumental in establishing Ireland's first working Republican Courts, which usurped the existing courts, and created a forum to try offenders, resolve grievances and adjudicate on land issues.He was first elected to Dáil Éireann as a Fianna Fáil TD for the National University of Ireland constituency at the 1932 general election and was re-elected at the 1933 general election.
He was appointed as Attorney General of the Irish Free State in March 1932.
In November 1936, he resigned as Attorney General and as a TD on his appointment as President of the High Court and a Judge of the High Court.
In 1946, he was appointed as Chief Justice of Ireland, that is the president of the Supreme Court of Ireland, where he served until 1961.