Michael Louis Vincent Walsh (born 5 August 1952) is an Irish music manager and judge on The X Factor UK. He was briefly replaced by Brian Friedman for Series 4, but when Brian proved too critical, he was brought back. Walsh even got a chance to be a judge on The X Factor USA when he subbed for Simon Cowell, who had been sick, when the auditions took place in Kansas City, Missouri in June 2012. For Series 9 of The X Factor, Walsh mentored the Groups category.
In May 2015, reports began to surface that he wouldn't be returing for Series 12. He stated he hadn't been hired, but he hadn't been sacked either, he just wasn't returning. On 18th June 2015, it was announced that he would be replaced by DJ Nick Grimshaw, fellow judge Rita Ora also replaced Mel B.
After the departures of Nick Grimshaw, Rita Ora and Cheryl Fernandez-Versini, it was announced that he would be returning to the judging panel for the show's 13th series alongside Sharon Osbourne and Nicole Scherzinger. In December 2016, he confirmed that he had signed on for two more series.
He is the most successful judge on the UK version in terms of his acts reaching the finals since they have done so in 2004, 2005, 2008, 2013 and 2016.