| Honorific-Prefix: | The Right Honourable |
| Sir John Ailbe O'Hara | |
| Honorific-Suffix: | KC |
| Term Start: | 8 April 2013 |
| Appointer: | Elizabeth II Charles III |
| Birth Date: | August 1958 |
| Birth Place: | Belfast, Northern Ireland |
| Profession: | Barrister |
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,[1] 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.[2]