"Undefeated" is a 2011 song by English hard rock band Def Leppard from their live album Mirror Ball – Live & More.

It was the first single from the album, and was released publicly via a YouTube clip on 12 April 2011 after having been played for the first time on Planet Rock the same day.

[3] A review of the song by Ultimate Classic Rock gave it a rating of two and a half out of five stars, and, while praising Joe Elliott's vocals, said that "[w]hile it's not a bad song, the whole thing just comes across as something that's been done before.

"[4] The song was used as the opener for most set lists for the Mirrorball[5] and Rock of Ages 2012 tours.

Hysteria residency in Las Vegas on 29 March 2013 where it was recorded and later released on the live album Viva!