Olof Wilhelm Peterson-Berger (born 27 February 1867 in Ullånger, Ångermanland, Sweden, died 3 December 1942 in Östersund, Sweden) was a Swedish composer. Peterson-Berger is best known for three albums of national romantic piano pieces entitled Frösöblomster I, II and III (Frösö Flowers), which includes the often performed Vid Frösö kyrka (At Frösö Church) and Sommarsång (Summer Song). His main musical influences were Edvard Grieg and Richard Wagner. His other works included the symphonies Sunnanfärd and Same-Ätnam, as well as the operas Ran, Arnljot, Domedagsprofeterna and Adils och Elisiv.

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