Richard Mór de Burgh, 1st Lord of Connacht (English: /dəˈbɜːr/ də-BUR; c. 1194 – 1242[1] or 1243[2][3]), was an Anglo-Norman aristocrat who was Seneschal of Munster and Justiciar of Ireland (1228–32).

He was the eldest son and heir of William de Burgh and his wife (daughter of Domnall Mór Ua Briain, King of Thomond).

[4] In 1224, Richard claimed Connacht (which had been granted to his father but never, in fact, conquered by him): he asserted that the grant to the Gaelic king Cathal Crobdearg Ua Conchobair (after William de Burgh's death in 1206), had been on condition of faithful service and that the king's son, Aedh mac Cathal Crobdearg Ua Conchobair (who succeeded that year) had forfeited it.

Having been given custody of the counties of Cork and Waterford and all the crown lands of Decies and Desmond, he was appointed Justiciar of Ireland (1228–32).

It was only in 1235, when he summoned the whole feudal host of the English lords and magnates to aid him, that he finally expelled the Gaelic king, Felim mac Cathal Crobderg Ua Conchobair, from Connacht.