Sten-Eggert Vergenhanns Nauclér (24 September 1914 – 5 November 1990) was a Swedish Army officer who served in various conflict areas, in Swedish service, Ethiopian service and as a volunteer. After a few years in the Swedish Army, Nauclér volunteered for service in the Winter War and later in the Continuation War in Finland. He returned to Sweden where he was promoted to captain in 1948 before travelling to Ethiopia to train officers for Emperor Haile Selassie's Imperial Guards. Nauclér was deployed in Korea with the Kagnew Battalion during the Korean War in 1951 and also served as head of the Ethiopian Liaison Section in Tokyo. In 1956 he was deployed in Egypt with the Swedish UN Battalion during the Suez Crisis and later in the Congo where he was commander of the Swedish UN Battalion during the Congo Crisis. Nauclér retired from the military in 1963 and then worked for a mining corporation in Liberia. During the Biafran War he led a Red Cross team with relief efforts.