Johan Georg Alexius Ræder (23 April 1905 – 23 May 1981) was a Norwegian diplomat.
He was born in Kristiania as a son of Major Nicolay Caspary Ræder (1870–1921) and Johanne Elisabeth Nicolaysen (1875–1940).
After being a deputy judge from 1927 to 1928 he was hired in the Norwegian Ministry of Foreign Affairs.
He served as an attaché in Paris from 1929 to 1931, as a secretary at the general consulate in London in 1932.
He served as the Norwegian ambassador to Belgium (and Luxembourg) from 1948 to 1951, to Francoist Spain from 1953 to 1957 and to Italy (and Greece and Malta) from 1965 to 1973.