Sjur Aasmundsen Sexe (14 August 1808 – 17 February 1888) was a Norwegian mineralogist and educator.
He was the son of Aamund Sjursen Sexe (1769–1864) and Brita Torsteinsdatter Mæland.
He grew up on a farm with pietist parents who were members of the Haugean movement.
He attended Bergen Cathedral School and took the examen artium in 1834.
During the years 1843–1844 he received a state scholarship to complete study trips at mines in Sweden and Germany and at the University of Berlin.