Opdahl is a Norwegian surname that derives from Old Norse Uppdalr (uppi; "up" and dale;"valley"). Notable people with the surname include:
Andreas Lothe Opdahl (born 1964), Norwegian computer scientist and professor of Information Systems Development Iren Opdahl (born 1974), Norwegian politician Jacob Opdahl (1894–1938), Norwegian Olympic gymnast Nils Opdahl (1882–1951 ), Norwegian Olympic gymnast Ørnulf Opdahl, (born 1944), Norwegian painter and educator Einar Opdahl, resident of Entwistle, Alberta who found a diamond in the Pembina River Johannes Opdahl, Norwegian carver who worked at the Nidaros Cathedral West Front
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