The Rotterdam Philharmonic Orchestra (RPhO; Dutch: Rotterdams Philharmonisch Orkest) is a Dutch symphony orchestra based in Rotterdam. Its primary venue is the concert hall De Doelen. The RPhO is considered one of the Netherlands' two principal orchestras of international standing, second to the Royal Concertgebouw Orchestra of Amsterdam. In addition to symphony concerts, the RPhO performs as the opera orchestra in productions at De Nederlandse Opera, as do other Dutch ensembles.