Oskar Fredrik Lindberg (23 February 1887 – 10 April 1955) was a Swedish composer, church musician, teacher and professor.In 1939 he edited the Church of Sweden's hymnbook. His 1912 Requiem was of particular importance to the history of Swedish liturgical works. At a meeting in Gagnefs missionary hall he heard a song that made a deep impression on him. For a radio broadcast in 1936 he arranged an organ piece based on this melody which became known as the Gammal fäbodpsalm från Dalarna. Today this is his best known and most frequently performed work.