Dermot O'Leary is an English-born, Irish television and radio presenter from Colchester. Born on 24 May 1973, he becomes widely known on British television as the presenter of Big Brother's Little Brother on Channel 4 before moving on to The X Factor on ITV.

He also presents programmes on the BBC and hosts his own show on BBC Radio 2. He is internationally noted for introducing Michael Jackson to a large audience in London in March 2009, during Jackson's final public appearance before his death.