Sverre Julius Gjellum (29 September 1919 – 23 April 1999) was a Norwegian diplomat. He was born in Kristiania, enrolled in law studies in 1939 and graduated from the University of Oslo with the cand.jur. degree in 1943. This was during the occupation of Norway by Nazi Germany, and he escaped to neutral Sweden, joined the Norwegian police troops-in-exile before travelling via the United Kingdom to Canada, where he underwent pilot training in Little Norway. In 1945 he returned to Norway and worked with the legal purge in the Oslo police. He started working for the Ministry of Foreign Affairs in 1946.