| Order: | 3rd |
| Office: | Chief Justice of Ireland |
| Term Start: | 1 June 1946 |
| Term End: | 11 June 1961 |
| Nominator: | Government of Ireland |
| Appointer: | Seán T. O'Kelly |
| Predecessor: | Timothy Sullivan |
| Successor: | Cearbhall Ó Dálaigh |
| Office1: | Judge of the Supreme Court |
| Term Start1: | 4 May 1946 |
| Term End1: | 11 June 1961 |
| Nominator1: | Government of Ireland |
| Appointer1: | Seán T. O'Kelly |
| Office2: | President of the High Court |
| Term Start2: | 11 March 1936 |
| Term End2: | 4 May 1946 |
| Nominator2: | Government of Ireland |
| Appointer2: | Domhnall Ua Buachalla |
| Predecessor2: | Timothy Sullivan |
| Successor2: | George Gavan Duffy |
| Term Start3: | 11 March 1936 |
| Term End3: | 4 May 1946 |
| Nominator3: | Government of Ireland |
| Appointer3: | Domhnall Ua Buachalla |
| Order4: | 4th |
| Office4: | Attorney General of Ireland |
| President4: | Éamon de Valera |
| Term Start4: | 10 March 1932 |
| Term End4: | 2 November 1932 |
| Predecessor4: | John A. Costello |
| Successor4: | James Geoghegan |
| Office5: | Teachta Dála |
| Term Start5: | February 1932 |
| Term End5: | 8 March 1936 |
| Constituency5: | National University |
| Birth Date: | 16 December 1889 |
| Birth Place: | Claremorris, County Mayo, Ireland |
| Death Place: | Sandymount, Dublin, Ireland |
| Resting Place: | Shanganagh Cemetery, Shankill, Dublin, Ireland |
| Nationality: | Irish |
| Party: | Fianna Fáil |
| Children: | 3 |
| Education: | Clongowes Wood College |
Conor Alexander Maguire (16 December 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 constituency from 1932 to 1936.
Maguire was born in Claremorris, County Mayo, in 1889.[1] He was educated at Clongowes Wood College and University College Dublin (UCD). At UCD, he was a founding member of the Legal and Economic Society (now known as the University College Dublin Law Society) in 1911.
He then 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.[2]
He was first elected to Dáil Éireann as a Fianna Fáil TD for the National University constituency at the 1932 general election and was re-elected at the 1933 general election.[3] He was appointed as Attorney General of the Irish Free State in March 1932.[4] 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.[5] 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.[1]