Fredrik Thorbjørn Kayser | |
|---|---|
| Born | 25 May 1918 |
| Died | 2 February 2009 (aged 90) |
| Allegiance | Norway |
| Service | Norwegian Army |
| Years of service | 1937–1938, 1940–1945 |
| Rank | Lieutenant |
| Unit | Norwegian Independent Company 1 (Norwegian: Kompani Linge) |
| Battles / wars | Norwegian heavy water sabotage, World War II |
| Awards |  St. Olav's Medal With Oak Branch (twice) Military Medal Légion d'honneur |
Fredrik Thorbjørn Kayser, MM (25 May 1918 – 2 February 2009) was a Norwegian resistance member during World War II. He was especially noted for his role in the Norwegian heavy water sabotage, and has been referred to as "Western Norway's Gunnar Sønsteby".