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“Birthday” is a disco song recorded by American singer Katy Perry for her fourth studio album, Prism (2013). It was written by Perry, Bonnie McKee and producers Dr. Luke, Max Martin, and Cirkut. Critics, as well as Perry herself, have compared the track to works by Prince and Mariah Carey. Through double entendres in the lyrics of “Birthday”, Perry makes sexual references while celebrating a partner’s birthday. The song was sent by Capitol to mainstream and rhythmic radio on April 21, 2014 as the fourth single from Prism.

Upon release, “Birthday” received generally positive reviews from music critics, who praised the song’s melody but occasionally criticized the sexual references. Following the release of Prism, “Birthday” entered the single charts of South Korea and France. After being released as an official single, it has become a moderate commercial success worldwide, reaching the top 30 in Australia, UK, and Netherlands, and has reached number 17 on the US Billboard Hot 100 and number 7 on the Canadian Hot 100. A music video for the track was released on April 24, 2014. Primarily recorded with hidden cameras, it features Perry disguised as five different characters in birthday parties and other celebrations.