Mats Ulf Stefan Björlin (21 May 1933 – 23 October 1993) was a Swedish composer and conductor. Bjorlin was known for being one of the most active opera composers in the 20th century. Björlin was born in Stockholm in 1933. He studied music with conductor Igor Markevitch in Salzburg, Austria at age 19 and later continued his studies at the Conservatoire de Paris, with teacher Nadia Boulanger. After completing his military service, he worked at the Royal Swedish Opera in Stockholm and at the Malmö College of Music. From 1962, he was employed as musical producer at Sveriges Radio and wrote music for several movies and television productions, including the series of films and TV series about the children on the island Saltkråkan (Seacrow Island), based on Astrid Lindgren's scripts.