"It's Five O'Clock Somewhere" is a song performed by Alan Jackson and Jimmy Buffett, and written by Jim "Moose" Brown and Don Rollins. It was released in June 2003 as the lead single from Jackson's 2003 compilation album Greatest Hits Volume II. It spent eight non-consecutive weeks at Number One on the Billboard Hot Country Songs chart in summer of 2003. In addition, the song hit number 17 on the US Hot 100, making it the biggest pop hit for Jackson and the first top forty hit for Buffett since the 1970s. On November 5, 2003, it also won the Country Music Association (CMA) Award for Vocal Event of the Year. The song became the #3 country song of the decade on Billboard's Hot Country Songs Chart.

The title refers to a popular expression used to justify drinking at any time of day, given that somewhere in the world it's 5:00 p.m. (the end of the work day for a traditional "nine-to-five" worker). The narrator states that he hasn't had a day off in over a year and that he wants to leave work and relieve his stress by drinking alcohol. The lyrics include the phrase, "It's only half-past twelve but I don't care. It's five o'clock somewhere", which means that even though it is not five o'clock in the narrator's time zone, it must be in another part of the world.

Jim "Moose" Brown wrote "It's Five O'Clock Somewhere" with Don Rollins. Although Brown had several other cuts recorded by other artists, this song was the first to make the final cut of an album. The title lyric was inspired by a teacher who worked with Rollins. Brown recorded the demo and offered it to Kenny Chesney, who turned it down. It was then offered to Alan Jackson, who said that he was looking for a song that he could record as a duet with Jimmy Buffett.

The portion of the music video featuring Jimmy Buffett was shot at Verizon Wireless Music Center in Noblesville, Indiana. The tiki bar featured in the video is the Square Grouper in Jupiter, Florida, near Jackson's home. It also features Jackson's personal boat, the "Hullbilly".

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