Karin Krog (born 15 May 1937 in Oslo, Norway) is one of the leading Norwegian jazz singers, the great granddaughter of Anders Heyerdahl (1832-1918), a Norwegian composer, musician, genealogist, folklorist and local historian, and married (1957-2001) to the jazz journalist Johannes (Johs.) Bergh (1932–2001). She is able to sing anything from standards to free improvisations.