Blå ("Blue") is a jazz club in Grünerløkka, Oslo, Norway. Blå opened on February 28, 1998; iniators were Kjell Einar Karlsen and Martin Revheim. It is located in factory building close to Akerselva, a river running through downtown. Darwin Porter of Frommer's describes the club as "the leading jazz club to Oslo. Dark and industrial, with lots of wrought iron and mellow lighting, this place books some of the best jazz acts in the world.