"Happy Days" is a song recorded by American rock band Blink-182. The song was released on July 1, 2019 through Columbia Records, as the third single from the band's eighth studio album, Nine. The song is a contemplative, up-tempo track regarding personal frustration. It was written by bassist Mark Hoppus, and drummer Travis Barker, as well as producer Tim Pagnotta, and songwriter Sam Hollander. Hoppus developed the song's concept based on his personal struggle with anxiety and depression.

Nine is the eighth studio album by American rock band Blink-182, released on September 20, 2019, through Columbia Records, as the band's first album on the label. The band began developing the album after fulfilling touring obligations for their previous release, California (2016). While Nine builds upon their collaboration with producer John Feldmann, who also produced California, it also utilizes additional outside producers and songwriters including Captain Cuts, the Futuristics, and Tim Pagnotta. Nine is the band's second and final album to feature both Feldmann and guitarist/vocalist Matt Skiba.