Oslo Chamber Music Festival is an annual festival held in mid Summer in Oslo.

Arve Tellefsen, renowned through many years as one of Norway's leading artists, founded Oslo Chamber Music Festival in 1989 to bring chamber music to a broader public than had been common in Norway . He is still the main spirit of the festival and the festival has through the years established itself as an important and popular contributor to Norway 's musical community.

Oslo Chamber Music Festival presents music spanning from medieval times to the present day. The Festival strives to keep a continuing high quality with interesting events and performers. It aims to offer music of premium quality to the public and be an attractive meeting place for some of the world's greatest musicians. Recruitment to chamber music is important to Oslo Chamber Music Festival, and it emphasises having children and adolescents among performers and visitors.

Oslo has several fabulous venues for concerts. Oslo Chamber Music Festival desires to extend the concert experience by using the city's cultural-historical treasures as concert venues. Akershus Fortress was selected the most popular area in Oslo by the city's inhabitants in 2005, and the Festival is proud to have the castle as the festival's bustling center.

HM Queen Sonja has been patron of Oslo Chamber Music Festival for several years.