| Order: | 9th |
| Office: | Chief Justice of Ireland |
| Term Start: | 1 June 2000 |
| Term End: | 23 July 2004 |
| Nominator: | Government of Ireland |
| Appointer: | Mary McAleese |
| Predecessor: | Liam Hamilton |
| Successor: | John L. Murray |
| Office1: | Judge of the Supreme Court |
| Term Start1: | 21 January 1996 |
| Term End1: | 28 November 2004 |
| Nominator1: | Government of Ireland |
| Appointer1: | Mary Robinson |
| Office2: | Judge of the High Court |
| Term Start2: | 11 July 1979 |
| Term End2: | 21 January 1996 |
| Nominator2: | Government of Ireland |
| Appointer2: | Patrick Hillery |
| Birth Date: | 20 July 1932 |
| Birth Place: | Castleknock, Dublin, Ireland |
| Nationality: | Irish |
| Party: | Fianna Fáil |
| Children: | 3 |
| Relations: | Diarmuid Gavin (son-in-law) |
| Education: | Blackrock College |
Ronan Colman Keane (born 20 July 1932[1]) is a retired Irish judge who served as Chief Justice of Ireland from 2000 to 2004, a Judge of the Supreme Court from 1996 to 2004 and a Judge of the High Court from 1979 to 1996.[2]
Keane was educated at Blackrock College, Dublin, and later graduated from University College Dublin (UCD) in 1953, with a BA in Modern History. He was called to the Bar in 1954[2] and became a Senior Counsel in 1970.[2] He was appointed as a High Court judge in July 1979.[2] He was head of the Tribunal of Inquiry into the Stardust fire in 1981,[2] and chairman of the Law Reform Commission from 1987 to 1992.[2] He has published many legal texts and papers, and participated in Council of Europe programmes developing legal systems in Post-Communist Europe.[2] He was elevated to the Supreme Court in 1996,[2] becoming Chief Justice in 2000. Chief Justice Keane received an Honorary Doctorate from UCD in 2001,[3] and has been an adjunct professor at Trinity College Dublin since his retirement.
In 1962, Keane married Therese O'Donnell, who, as Terry Keane, became a fashion journalist and later a social diarist. They had three children together, and later became close to Terry's daughter, who had been adopted. The couple separated in the 1980s but remained amicable. Their son Tim died suddenly in 2004.[4] In 1999, Terry revealed on The Late Late Show her affair beginning in 1972 with sometime Taoiseach Charles Haughey.[5] Ronan and Terry's daughter Justine Keane is married to Diarmuid Gavin, the Irish garden designer and television personality.
Keane was for some years the Independent Chairman of the Appeals board of the Turf Club of Ireland.[6]