The Orchestre Philharmonique de Monte-Carlo (Monte-Carlo Philharmonic Orchestra; Orchestre National de Monte-Carlo; Orchestre National de l'Opéra de Monte-Carlo; = OPMC) ) is the main orchestra in the principality of Monaco. The orchestra gives concerts primarily in the Auditorium Rainier III, but also performs at the Salle des Princes Grimaldi Forum.
The OPMC was founded in 1856 and gave its first concert on December 14, 1856, with an ensemble of 15 musicians, at the "Maison de jeux" (the future casino). By 1874, the orchestra had increased in size to 70 musicians. In 1953, Prince Rainier III had ordered the renaming of the ensemble to L'Orchestre National de l'Opéra de Monte-Carlo. It acquired its current name in 1980, again through Rainier
The OPMC's most recent principal conductor was Yakov Kreizberg, who was named to the post in October 2007, effective with the 2009-2010 season, for an initial contract of 5 years. He held the post until his death in March 2011.