Halvard Manthey Lange (16 September 1902 – 19 May 1970) was a Norwegian politician and diplomat, who served as the Minister of Foreign Affairs from 1946-1963 and again from 1963-1965. He was also the longest serving Foreign Minister to date, having served a total of 19 years. He became a member of the Labour Party in 1927. Two years later, in 1929, he earned a Master of Arts degree. He worked as a teacher 1930-35 and lectured at the University of Oslo 1935-38. He was arrested by the Nazi German occupying forces in 1942 and spent the rest of the war in various concentration camps.