Smile.dk is a Swedish pop group founded in 1998. The band gained worldwide fame thanks to the song "Butterfly" which became an iconic part of the Dance Dance Revolution video game series. The group's name includes the suffix ".dk," referring to the focus of their first album on the Danish market. Smile.dk performs electronic and pop music, combining catchy melodies with danceable rhythms. Their work influenced the development of dance-pop music in the late 1990s and early 2000s.

• Genres: Электроника, Поп
• Country: Sweden
• Language: English, Gaelic