Otto von Friesen (born 11 May 1870 in Kulltorp, died 10 September 1942) was a linguist, runologist and professor of the Swedish language at Uppsala University from 1906-1935.
He was also a member of the Swedish Academy from 1929-1942, serving in Chair 9.
Friesen began teaching in Nordic Languages at Uppsala University in 1897 and finished his dissertation there in 1898.
He became a Professor of Swedish in 1906.
Published works include Om de germanska mediageminatorna (1897), Till den nordiska sprÄkhistorien (1901 and 1906), as well as Om runskriftens hÀrkomst (1904-06), VÄr Àldsta handskrift pÄ fornsvÀnska (1906) and "Kylverstenen" (in Antiqv.