Tadhg mac Murchadh Ó Briain (anglicised Teige Mac Murrough O’Brien), died 1577, was an Irish soldier and official who served as the first sheriff of Thomond between 1570 and 1571.
Ó Briain played an active political and military role during the Tudor reconquest of Ireland. He was a son of Murrough O'Brien, 1st Earl of Thomond and Eleanor fitz John. Ó Briain had four children:
Honora Ní Briain
Toirdhealbhach Ó Briain
Slany Ní Brien
Amy Ní Brien