"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 #1 on Billboard Hot Country Songs in the summer of 2003, and ranked #4 on the year-end chart. In addition, the song peaked at #17 on the Billboard Hot 100 in September, and ranked #65 on the year-end Hot 100, making it the biggest pop hit for Jackson and the first top forty hit for Buffett since the 1970s.

Alan Eugene Jackson is an American country music singer-songwriter. He is known for performing a style widely regarded as "neotraditional country", as well as penning many of his own songs. Jackson has recorded 21 studio albums, including two Christmas albums, and two gospel albums, as well as released three greatest-hits albums.