Gustav Harald Edelstam (March 17, 1913 – April 16, 1989) was a Swedish diplomat. During World War II he earned the nickname Svarta nejlikan ("the Black Pimpernel," a reference to the Scarlet Pimpernel) for helping SOE agents and saboteurs escape from the Germans. During the early 1970s he was stationed in Santiago, Chile, and became known as the "Raoul Wallenberg of the 1970s" when he helped over 1,200 Chileans, hundreds of Cuban diplomats and civilians, and 67 Uruguayan and Bolivian refugees escape persecution by dictator Augusto Pinochet.
Edelstam was born in , Sweden, and was the son of chamberlain Fabian Edelstam and Hilma Dickinson. He was the older brother of the ambassador Axel Edelstam and grandson of member of parliament Ernst Edelstam. Edelstam passed studentexamen in 1933 and earned a Candidate of Law degree in Stockholm in 1939 before becoming an employed as an attaché at the Ministry for Foreign Affairs in Stockholm the same year.
He served in Rome in 1939 and the Foreign Ministry in Stockholm in 1940, in Berlin in 1941, Oslo 1942 where Edelstam became acting Second Vice Consul in 1944. As a diplomat in Nazi-occupied Norway, Edelstam saved the lives of hundreds of Jews and anti-Quisling freedom fighters.
He was acting Second Secretary at the Foreign Ministry in Stockholm in 1944 and was Secretary to the Minister for Foreign Affairs from 1946 to 1948. Edelstam was Second Secretary at the Foreign Ministry in Stockholm in 1946, acting First Secretary in 1948 and First Legation Secretary in The Hauge in 1949 and in Warsaw in 1952. He was then First Secretary at the Foreign Ministry in Stockholm in 1953 and acting Director there in 1956. In 1958 Edelstam was sent to Vienna as Embassy Counsellor and in 1962 to Istanbul as Consul General. He stayed in Istanbul until 1965 and was thereafter ambassador in Jakarta, also accredited to Manila from 1966 to 1968. Edelstam was then sent to Central America where he was ambassador in Guatemala City, also accredited to Managua, San José, San Salvador and Tegucigalpa from 1969 to 1972. In 1972 he was sent to Santiago de Chile as ambassador.