The Oslo Philharmonic (Oslo-Filharmonien) is a Norwegian symphony orchestra based in Oslo, Norway. The orchestra was founded in 1919, and has since 1977 had its home in the Oslo Concert Hall. The orchestra consists of 69 musicians in the string section, 16 in the woodwinds, 15 in brass, 5 in percussionists, 1 harpist, and 1 pianist. The orchestra gives an average of sixty to seventy symphonic concerts annually, the majority of which are broadcast nationally on the radio. The orchestra also performs chamber concerts frequently throughout the year.
The Oslo Philharmonic Orchestra's roots go back to 1879, when Edvard Grieg and Johan Svendsen founded the Christiania Musikerforening (Christiania Musical Association), as a successor of The Philharmonic Society (Det Philharmoniske Selskab, 1847).
The orchestra was later conducted by Ole Olsen, Johan Selmer, Iver Holter and Otto Winter-Hjelm. Under Holter, the orchestra was merged with the Christiania Theatre Orchestra, which was on the verge of reductions. Holter suggested the founding of a city orchestra which could play at municipal festivities, concerts and in the theatre, and as a result of this, the orchestra gained municipal support from 1889.