Constantin Vi?oianu (4 February 1897 – 4 January 1994) was a Romanian jurist, diplomat and politician.
He studied at the University of Bucharest and got a doctor's degree in Law at the Sorbonne in Paris.
Constantin Vi?oianu was technical advisor at the League of Nations.
From 1931 to 1933 he was member of the Romanian permanent delegation to the Conference on Disarmament.
He was thereafter appointed minister plenipotentiary to The Hague (1933–1935) and Warsaw (1935–1936)
He was Minister of Foreign Affairs of Romania from 4 November 1944 to 5 March 1945.
Forced to flee from Romania when the Communist party rose to power, Constantin Vi?oianu was chairman of the Romanian National Committee from 1948 to 1975.