"Happy" is a song written, produced, and performed by American musician Pharrell Williams, released as the only single from the soundtrack album for the film Despicable Me 2 (2013). The song was first released on November 21, 2013, alongside a long-form music video. The song was reissued on December 16, 2013, by Back Lot Music under exclusive license to Columbia Records, a division of Sony Music. The song also served as the lead single from Williams' second studio album, Girl (2014).

The official remix features American rapper Sky Blu of LMFAO.