Unto Mononen (October 23, 1930, Muolaa – June 28, 1968, Somero) was a Finnish songwriter and musician. He is best known for his numerous tango compositions including the famous Finnish tango song, "Satumaa". His first name was originally Uuno.
Mononen is often said to come from Somero, but was actually from Muolaa and did not come to Somero until the Second World War was over and Muolaa was conquered by the Soviet Union. Mononen studied church music in the University of Turku. He quit these studies since he felt he did not learn anything important. As a composer he was self-taught. Mononen began his musical career by singing with local dance groups while he was under 20. After a failed operation to his adenoids damaged his voice, Mononen started to compose.
In 1950, Mononen first successfully sold his songs to a record company. The first song recorded was "Pieni laulu" ("A small song"), a waltz sung by Pentti Halme. In 1955 Henry Theel recorded the famous "Satumaa" to some success, but the song's status wasn't cemented until seven years later, in 1962, when Reijo Taipale recorded it.