Oskar Hasselknippe (18 January 1911 – 4 July 2001) was a Norwegian newspaper editor. He is known for his work in the Norwegian resistance movement and as editor of Verdens Gang during its swift ascent among Norwegian newspapers.
Hasselknippe was born in Biri as a son of car mechanic Lars Hasselknippe (1891–1946) and Paula Elvestad (1889–1979). He finished his secondary education in 1931, and worked as a journalist in Velgeren until 1938 (with interruptions while undergoing pilot training with the Royal Norwegian Navy Air Service and at civilian air schools), and then as subeditor in Ringerikes Blad. When World War II reached Norway on 9 April 1940, with the German invasion, Hasselknippe fought for Norway as a lieutenant in the engineer corps. When the battles were over, Hasselknippe joined Milorg. He also got married in 1940, to technician Jenny Hansen (1907–1979). Besides Milorg resistance work, he continued in Ringerikes Blad.
Hasselknippe's main task was to receive and distribute weapons, ammunition, and supplies dropped in the forest by aircraft. He operated in the Ringerike district, as well as in Hallingdal, Krokskogen, and Hadeland. Hasselknippe eventually became wanted by the German occupiers of Norway. His editor-in-chief in Ringerikes Blad, Kaare Filseth, covered for him, but was ultimately seized as a hostage and shot by the Germans. Hasselknippe went into hiding and survived, and was district commander for Milorg from 1943 to 1945. He was decorated with the British King's Medal for Courage.