"Happy Song" is a song by British rock band Bring Me the Horizon. Produced by keyboardist Jordan Fish and vocalist Oliver Sykes, it was featured on the band's 2015 fifth studio album That's the Spirit and released as the second single from the album on 13 July 2015. The single topped the UK Rock & Metal Singles Chart and reached number 55 on the UK Singles Chart, number 2 on the US Billboard Mainstream Rock chart and number 19 on the Billboard Hot Rock Songs chart.

One of the first songs written for the album, "Happy Song" embodies the main theme of That's the Spirit, with lyrics primarily written about depression. Due to its repeated use of the titular phrase, the song is considered the unofficial title track of the album, and has been performed as the opening song at the majority of dates on the album's promotional concert tour. Many critics have hailed the track as a highlight of the album, praising its heavier style including prominent guitar riff.

In line with the loose concept of That's the Spirit, the lyrics for "Happy Song" were written about "making light of a shitty situation", in particular referring to depression. Due to its use of the phrase "that's the spirit", the song has been described by the band's frontman Oliver Sykes as the album's "unofficial title track". Speaking in a track-by-track commentary for Spotify, the vocalist described the phrase as "ironically bleak", noting that "It's only ever really used by people when they have no idea what to say. There's no answer, no solution; the only thing you can say is just 'get on with it', and that's what "Happy Song" is all about".

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