The X Factor is a British television music competition to find new singing talent. The eighth series aired on ITV on 20 August 2011 and ended on 11 December 2011. Dermot O'Leary hosted the main show on ITV, while Caroline Flack and series 6 runner-up Olly Murs co-presented the spin-off show The Xtra Factor on ITV2. Louis Walsh returned to the judging panel and was joined by Gary Barlow, Kelly Rowland and Tulisa. Barlow, Rowland, Tulisa joined the panel replacing judges, Simon Cowell, Dannii Minogue and Cheryl Cole. Series 5 winner Alexandra Burke served as a guest judge for week 4 of the live shows due to Rowland having a throat infection.

The X Factor is a British reality television music competition, created by Simon Cowell. Premiering on 4 September 2004, it was produced by Fremantle's British entertainment company, Thames, and Cowell's production company Syco Entertainment for ITV, as well as simulcast on Virgin Media One in Ireland. The programme ran for around 445 episodes across fifteen series, each one primarily broadcast late in the year, until its final episode in December 2018. The majority of episodes were presented by Dermot O'Leary, with some exceptions: the first three series were hosted by Kate Thornton; while Caroline Flack and Olly Murs hosted the show for the twelfth series.