| Office: | Judge of the High Court |
| Term Start: | 11 March 1996 |
| Term End: | 23 November 2018 |
| Nominator: | Government of Ireland |
| Appointer: | Mary Robinson |
| Office1: | Judge of the Circuit Court |
| Term Start1: | 13 January 1987 |
| Term End1: | 11 March 1996 |
| Nominator1: | Government of Ireland |
| Appointer1: | Patrick Hillery |
| Birth Date: | 10 August 1946 |
| Birth Place: | Belfast, Northern Ireland |
| Children: | 3 |
| Education: | Blackrock College |
Michael Anthony Moriarty, SC (born 10 August 1946) is a retired Irish judge who served as a Judge of the High Court from 1996 to 2018 and a Judge of the Circuit Court from 1987 to 1996.
Born in Belfast in 1946 to parents James and Nora Moriarty.[1] He moved to Dublin in 1960 and was educated at Blackrock College, University College Dublin and King's Inns. He was called to the Irish Bar in 1968, and became a Senior Counsel in March 1982.[1] He specialised in criminal law at the bar.
He was appointed Chairman of the Employment Appeals Tribunal in 1986.
He became a Circuit Court judge in 1987. He was subsequently appointed a High Court judge in March 1996.[2] He was the chairperson of the Lord Mayor's Commission on Crime.
He is best known as Chair of the Moriarty Tribunal, which he chaired between 1997 and 2010.[3] The Tribunal investigated the financial affairs of former Taoiseach Charles Haughey and former Minister Michael Lowry.[4] The first report, in 2006, found that Haughey had misappropriated funds.[5] The second report, delivered in 2011, found that Lowry had shared information with Denis O'Brien "of significant value and assistance" to aid in the awarding of a mobile telephone licence.[6]
He retired in April 2018, following 31 years as a judge.
He was formerly married to Mary Irvine, with whom he has three children.[7] He subsequently married Doreen Delahunty.