Knud Knudsen is the name of:
Knud Knudsen (linguist) (1812–1895), Norwegian linguist Knud Knudsen (photographer) (1832–1915), professional photographer Knud Leonard Knudsen (1879–1954), gymnast Knud Christian Knudsen (1887–1969), Norwegian merchant and politician
Knut Knudsen (born 12 October 1950), retired Norwegian road and track cyclist