Seán Dermot Fintan O'Leary (born 24 May 1973) is an English broadcaster. He presented the television talent show The X Factor on ITV from 2007 until its final series in 2018, with the exception of 2015. 

Since 2021, O'Leary has presented ITV's This Morning on Fridays, school holidays and bank holidays alongside Alison Hammond, a role expanded to the remainder of the week on a rotation with the departures of Phillip Schofield and Holly Willoughby in the summer and autumn of 2023.