Egil Yngvar Olbjørn (1902–1982) was a Norwegian police leader.
He came to prominence during the occupation of Norway by Nazi Germany, as a member of Nasjonal Samling and supporter of Jonas Lie. He headed the police branch Ordenspolitiet. To a certain degree he tried to resist German control, and was imprisoned for a short period in the autumn of 1944. He was saved from prison by Jonas Lie, and Olbjørn stood by Lie's side when they entrenched themselves at Skallum on 8 May 1945 after the Nazi capitulation; however Olbjørn gave up, and left Skallum some days before Lie (who died there on 11 May).
Olbjørn is also known as a judge (together with Karl Marthinsen and Egil Reichborn-Kjennerud) in the special court that sentenced Gunnar Eilifsen to death in 1943. During the legal purge in Norway after World War II, Olbjørn was sentenced harshly for Nazi collaboration.
- Ringdal, Nils Johan (1995). "Olbjørn, Egil Yngvar". In Dahl, Hans Fredrik. Norsk krigsleksikon 1940-45. Oslo: Cappelen. Retrieved 28 August 2010.
- Ringdal, Nils Johan (1989). Gal mann til rett tid. Sverre Riisnæs—en psykobiografi (in Norwegian). Oslo: Aschehoug. pp. 139–143. ISBN 82-03-16110-3.
- Jørgensen, Jørn-Kr. "Gunnar Eilifsen". In Helle, Knut. Norsk biografisk leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Retrieved 28 August 2010.
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