Gunnar Hauk Gjengset (born May 10, 1946) is a Norwegian philologist and author. Gjengset was arrested in the Soviet Union in January 1970 for demonstrating against the Brezhnev regime. Gjengset had traveled to Leningrad in order to distribute leaflets supporting the release of author Yuri Galanskov and war-hero Pyotr Grigorenko, both known dissidents. In the trial that followed, Gjengset was sentenced to one year of imprisonment, but was freed after one month of internment due to international pressure. He later wrote the book, Under jernteppet (Behind The Iron Curtain) about the experience.