"City of Angels" is a song by American rock band Thirty Seconds to Mars, featured on their fourth studio album Love, Lust, Faith and Dreams (2013). Written by lead vocalist Jared Leto, who co-produced the song with Steve Lillywhite, "City of Angels" was inspired by Leto's experience of living in Los Angeles with his family and was influenced by the city's culture. Imbued with elements of synthrock as well as music from the 1980s, the track was cited as an example of the album's variety and experimentation. It was one of the first songs to be written for Love, Lust, Faith and Dreams, but required a long period of time to record.

"City of Angels" was released as a promotional single in July 2013 in the United States, and was serviced to mainstream radio in Europe in October 2013. It received general acclaim from music critics, who commended the composition, the lyrics, and Leto's vocal performance. Following the release of Love, Lust, Faith and Dreams, the track appeared in the lower regions of the UK Rock Chart. When released as a single, it re-entered the chart reaching number 21, peaked at number eight on the Alternative Songs in the US, and experienced moderate success in some international markets due to digital sales from the album. A piano version of the song was digitally released in July 2014.

Jared Leto directed the music video for the song, which features several personalities joining the three members of Thirty Seconds to Mars in sharing their visions about Los Angeles. The video was favorably reviewed by critics, who complimented the simplicity and cohesion with the song's message. It received the Loudwire Music Award for Best Rock Video and was nominated for Best Cinematography at the 2014 MTV Video Music Awards. Thirty Seconds to Mars performed a piano rendition of the song at the 2014 iHeartRadio Music Awards. "City of Angels" was included in the setlist of the band's Love, Lust, Faith and Dreams Tour and subsequent Carnivores Tour.

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