Dennie Christian (artist's name of Bernhard Althoff) (Bergisch Gladbach, May 22, 1956) is a German singer of Schlager music popular in Germany and the Netherlands; he sings in both languages.
His breakthrough song was "Rosamunde" (a version of the Beer Barrel Polka, 1974), and one of his biggest Dutch hits was "Guust Flater en de Marsupilami" (a song about comic character Gaston and his friend the Marsupilami).
In 2017 he participated in the Dutch TV show Beste Zangers