Sir John Ailbe O'Hara KC (b. 1958) is a Judge of the High Court of Justice in Northern Ireland.

A native of Belfast and a graduate of St Mary's Christian Brothers Grammar School,Notice regarding O'Hara's appointment as Judge of the High Court of Justice in Northern Ireland, erstni.org. Accessed 21 November 2022. Mr Justice O'Hara was sworn into office before the Rt Hon Sir Declan Morgan, Lord Chief Justice of Northern Ireland, on 8 April 2013. He was called to the Bar of Northern Ireland in 1979 and was named Queen's Counsel in 1999.Profile , judiciaryni.uk. Accessed 21 November 2022.

Cases THE BELFAST HEALTH AND SOCIAL CARE TRUST (12 October 2012) Acquittal of Ivor Bell (28 October 2019)

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