Oskar Lindberg (23 February 1887 – 10 April 1955) was a nationalist/romantic composer who in 1939 edited the Church of Sweden's hymnbook. His 1912 Requiem was of particular importance to the history of Swedish liturgical works.
He wrote in a romantic idiom which blended features of composers such as Rachmaninoff and Sibelius with folk music and impressionistic elements.
Lindberg was also prominent as a teacher, holding posts in the conservatory in Stockholm as well as in local high schools. He was a member of the Swedish Royal Academy of music from 1926 until his death.
He is the uncle of jazz musician and composer Nils Lindberg.