Seán Kevin O'Brien (born 14 February 1987) is an Irish professional rugby union player for English Premiership Rugby side London Irish. He previously represented home province Leinster, and internationally he played for Ireland and toured twice with the British & Irish Lions. O'Brien can play across the back-row, though he primarily plays as an openside flanker. In 2019 he caused controversy by urinating on a member of the public in a Dublin bar, which he later admitted in an IRFU investigation. The incident was reported in national newsprs in Ireland