The third and final season of the American music competition television show The X Factor premiered on Fox on September 11, 2013, and ended on December 19, 2013. This season was hosted by Mario Lopez. Simon Cowell and Demi Lovato returned to the judging panel, while Kelly Rowland and Paulina Rubio joined the panel as replacements for the departing judges.

The X Factor is an American reality television music competition show created by Simon Cowell and produced by FremantleMedia North America and SYCOtv, a partnership between Cowell and Sony Music Entertainment, which aired on Fox. Based on the original UK show, and an addition to The X Factor franchise, the series found new singing talent, drawn from public auditions, and they competed against each other for votes. The winner is determined by the show's viewers via telephone, the Internet, and SMS text voting, and is awarded a recording contract with Cowell's record label Syco Music, worth $5 million in seasons one and two, and $1 million in season three. America voted for the following winners: Melanie Amaro, Tate Stevens, and Alex & Sierra, respectively.