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.