Constantin Coanda (4 March 1857 – 30 September 1932) was a Romanian soldier and politician.
He reached the rank of general in the Romanian Army, and later became a mathematics professor at the National School of Bridges and Roads in Bucharest.
Among his seven children was Henri Coanda, the discoverer of the Coanda effect.
During World War I, for a short time (24 October – 29 November 1918), he was the Prime Minister of Romania and the Foreign Affairs Minister.
He participated in the signing of the Treaty of Neuilly between the Allies of World War I and Bulgaria.
Coanda was born in Craiova.
On 8 December 1920, during his term as President of the Senate of Romania (representing Alexandru Averescu's People's Party), he was badly wounded by a bomb set up by the terrorist and anarchist Max Goldstein.
He died on 30 September 1932, aged 75, in Bucharest.