"Up All Night" is a song by American rock band Blink-182, released on July 14, 2011 as the lead single from the group's sixth studio album, Neighborhoods (2011). The song was the band's first single following a four-year hiatus. It was the first song the trio created upon their reformation in February 2009. Although the band wanted to release the track as a digital single in July 2009, they quickly decided it was too ambitious to complete before their fall reunion tour. The track generally grew heavier over the course of two-year recording process.

The song premiered July 14, 2011, on Los Angeles radio station KROQ-FM and the band's official website. A digital single was released the following day. Critics received the song positively, with many favorably noting similarities with the band's side-projects. Two music videos were released for "Up All Night" in August 2011. The main video, directed by Isaac Rentz, features the band playing in a neighborhood during a reckless block party, and a second video features a montage compiled from fan-made YouTube videos that used the band's music illegally. Critics generally reacted to both videos favorably, with many media outlets covering the fan-made compilation.

After the reunion at the 2009 Grammy Awards, Blink-182 began production on a new studio album. As the band got back together, drummer Travis Barker said that the trio immediately "got inspired" by practicing their old songs and listening to them again, and they decided to record demos. There were four demos done, and only one was near completion, called "Up All Night". The song was originally titled "The Night the Moon Was Gone", a name DeLonge's daughter, Ava, came up with. Quickly they realized that it was too ambitious to complete it before their reunion tour began in July.

When the band set off on tour, Tom DeLonge described the song as "almost finished." The band raised concerns that the song would debut to some fans as a bootleg-recorded version on sites such as YouTube, and opted to not release it: "It’s not so much that we were concerned that it was going to get played somewhere where we didn’t have control of it," said DeLonge. "We were just concerned that the first impressions weren’t going to be the beautiful hard work that we put into recording the song and the way we recorded it. The foundation of the song remains largely the same as when the band first began work on it in 2009, but as they recorded more songs, they kept coming back to "Up All Night", and the song became "harder and heavier than its original incarnation", according to Hoppus, "Initially the chorus had much more air. It was a lofty, synth-y chorus, but we wanted the first song that people heard to be much more of a rocker." The band changed much of the song's instrumentation and wrote heavier guitar and bass parts, and DeLonge wrote the guitar progression for the chorus. Barker then began work on the drum portion of the song which, according to Hoppus "really solidified the rock element of the track. The half-time intro of the last section was all him, and I think punctuates the song very well."

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