Conor Myles John O'Brien, 18th Baron Inchiquin (born 17 July 1943) is an Irish peer and farmer.He is the son of Fionn Myles Maryons O'Brien (28 October 1903 – 2 August 1977) and Josephine Reine Bembaron (died 27 October 2011).
Fionn was the son of Lucius William O'Brien, 15th Baron of Inchiquin and Ethel Jane Foster.
He was educated at Radley College, Abingdon, Oxfordshire and at Loughborough College, Leicestershire.
Conor Myles John O'Brien was educated at Eton, he succeeded to the peerage on the death of his uncle, Phaedrig O'Brien, 17th Baron Inchiquin, in 1982.
In 1998, he visited Antioch, California for St.
Patrick's Day and Antioch's first St.
Patrick's Day Crinniu, hosted by then-Councilman Allen Payton and the city's council proclaimed "Sir Conor O'Brien Day".
He married Helen Regina Farrell and together they have two children, The Hon.
Slaney O'Brien and The Hon.
IN April 2010, O'Brien was awarded €7.9m in damages by the High Court over the repudiation of an agreement to buy 377 acres out of the 600 acres of the Dromoland estate which his family still owned.In 2012, in a long running dispute with the management of Dromoland Castle, Inchiquin was refused an application to the High Court for them to return 37 paintings that were loaned several decades prior.