Nordhagen is a surname of Norwegian origin. It may refer to:
*Olaf Nordhagen (1883âÂÂ1925), Norwegian architect, engineer, and artist; son of Johan
*Rolf Nordhagen (botanist) (1894âÂÂ1979), Norwegian botanist; son of Johan
:*Per Jonas Nordhagen (1929âÂÂ2025), Norwegian art historian; son of Rolf
:*Rolf Nordhagen (physicist) (1927âÂÂ2013), Norwegian physicist and computer scientist; son of Rolf