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|Parent house||Uí Briúin Ai / Síl Muiredaig|
|Founded||AD 74|
|Founder||Conchobar mac Taidg Mór|
|Current head||Desmond O'Connor Don|
|Final ruler||Fedlim Geancach Ó Conchobair|
O'Connor (Middle Irish: Ó Conchubhair; Modern Irish: Ó Conchúir, also anglicised as O'Connor), is an Irish princely and noble family of Gaelic origin, whose line included the historic Kings of Connacht and the last High Kings of Ireland. The family seat is Clonalis House outside Castlerea in County Roscommon.
The Ó Conchubhair Donn is the head of a lineage which provided about one hundred Kings of Connacht, thirty Chiefs of the Name and two High Kings of Ireland, Tairrdelbach Ua Conchobair (1088–1156), and his son Ruaidrí Ua Conchobair (c. 1115–1198), the last High King.
The O'Connor family can trace their lineage back to the 5th century without dispute. Some medieval accounts suggest descent from the Milesian kings, whose pedigree was claimed to lead to Japheth the son of Noah, ten generations from the Biblical Adam.
During the late 14th century, the Ó Conchubhair dynasty grouped into two main divisions, one led by Toirdealbhach Ruadh, the other by Toirdealbhach Óg (also called Toirdealbhach Donn), both in the seventh generation of descent from Cathal Crobhderg. From these descended the families of Ó Conchubhair Ruadh (now extinct) and Ó Conchubhair Donn.
One of Ireland's preeminent 19th-century historians, John O'Donovan, once said of the O'Connor's that "No family in Ireland claims greater antiquity and no family in Europe, royal or noble, can trace its descent through so many generations of legitimate ancestors."[full citation needed]
The clan name originated in the 10th century as a derivative of its founder Conchobar mac Taidg Mór. The family contributed to Irish society in art, history, language, politics, diplomacy, and other areas before, during and after foreign rule in Ireland. They descend in the paternal line from the Connachta's Uí Briúin Ai.
The O'Connor name has metamorphosed many other surnames, some of which are O'Conner, Connor, Conner, Conners, Connors. Some people of these surnames may still descend from Ruaidrí Ua Conchobair, but many would descend from other O'Connor septs such as O'Connor offaly or O'Connor Kerry.
On the death in 1981 of Rev. Charles O'Conor Don SJ, Clonalis House, the ancestral seat of the O'Connor Don family, passed to his sister Gertrude O'Conor Nash. Consequently, and not for the first time, the family title and family seat were separated. The O'Conor Nash family now reside at Clonalis House where they maintain the O'Connor archives.