Professional ratings
Review scores
Source	Rating
AllMusic
Chicago Tribune
Entertainment Weekly	A−
Pitchfork Media	9.0/10
Rolling Stone
The Rolling Stone Album Guide
The Village Voice	A−

Under a Blood Red Sky is a live album by Irish rock band U2, produced by Jimmy Iovine and released in 1983. Along with its companion concert film, U2 Live at Red Rocks: Under a Blood Red Sky, the release helped establish U2's reputation as a live band, making the band a popular live college rock act.

The album consists of live recordings from three shows on the band's War Tour, from Colorado and Boston in the US and from Germany.

An accompanying concert video entitled U2 Live at Red Rocks: Under a Blood Red Sky was released the following year. Unlike the album, the film was recorded entirely at the outdoor Red Rocks Amphitheatre on 5 June 1983. The band's performance of "Sunday Bloody Sunday" from the film has been cited as one of Rolling Stone's "50 Moments that Changed the History of Rock and Roll."

The title is taken from the lyrics of the song "New Year's Day", originally released on U2's War album.

The album was re-released on 29 September 2008 as a remastered CD with a DVD of the Red Rocks concert.

All tracks written by U2, with lyrics by Bono.

Notes
During the performance of "The Electric Co.", Bono included a 27-second snippet of Stephen Sondheim's "Send in the Clowns". When Under a Blood Red Sky was released, U2 failed to get permission and pay the appropriate licensing and royalty fees to include that piece of Sondheim's tune on the album. When Sondheim objected, U2 agreed to pay a $50,000 (US) penalty for the unauthorized use and to press all future releases with a new version that did not include the snippet.

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