Casa da Música is a major concert hall space in Porto, Portugal which houses the cultural institution of the same name with its three orchestras Orchestra Nacional do Porto, Orchestra Barroca und Remix Ensemble. It was designed by the Dutch architect Rem Koolhaas with Office for Metropolitan Architecture and Arup-AFA, and was built as part of Porto's project for European Culture Capital in 2001 but was only finished in the first half of 2005 and immediately became an icon in the city. The Building engineers were Ove Arup - London together with Afassociados, Oporto.

Although the opening day concert took place on the April 14 with Clã and Lou Reed, the building was inaugurated on April 15, 2005 by the Portuguese president. The Prime-minister and many other notable politicians and Porto society were present for the concert by the Orquestra Nacional do Porto.