Dermot Gleeson SC (born 22nd April 1948) is an Irish barrister who served as Attorney General of Ireland from 1994 to 1997.

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Educated in Blackrock College, Dublin and University College Dublin. Gleeson holds B.A. and LL.M degrees and qualified as a barrister at the King's Inns, Dublin. His father was a barrister and was later appointed a Circuit Court Judge, and two of his brothers are also barristers. Gleeson was called to the Irish bar in 1970 and first practised law on the Cork Circuit, away from Dublin, Ireland's main legal centre. In the early 1970s Gleeson was a part-time lecturer in Constitutional Law at University College Cork.

Gleeson moved to Dublin when he was appointed a Senior Counsel in 1979, at age 30. He is believed^[who?] to be the youngest 'silk' appointed in the common law world in the last century, beating noted counsel such as the Australian QC Tony Morriss, who was made a silk at 32.^{[citation needed]}

Gleeson was a leading barrister in Ireland in the 1980s and 1990s before he became a senior government advisor and then a businessman. From 1994–1997, Gleeson was Attorney General of Ireland, serving as chief legal advisor to the government of Taoiseach John Bruton. Gleeson is a Bencher of King's Inns. He is also a visiting fellow at the School of Law at University College Dublin.

In more recent years Gleeson became known for his business career. In 2000, he joined the board of Independent News and Media Plc as a non-executive director and in 2003, he was appointed Chairman of Ireland's largest bank Allied Irish Banks. His time in charge of AIB Group coincided with the Global Financial Crisis, which resulted in the enormous drops in its share price, leading to the infamous 'egging' incident at AIB Group's May 2009 shareholder's meeting.^[1] In 2003, Gleeson was appointed ombudsman for the Diamond Trading Company (DTC), the marketing offshoot of diamond mining giant De Beers. In 2007, he was appointed chairman of the Governing Body of University College, Cork.

Gleeson is a former Auditor of the Literary and Historical Society, University College Dublin, and winner of the Irish Times National Debating Championship.

He currently resides in Dublin. He is married and has four children.

• Auditors of the Literary and Historical Society (University College Dublin)