Constantine Sidamon-Eristoff (June 28, 1930 – December 26, 2011) was an American-born Georgian aristocrat and the New York City highway commissioner during the administrations of John V. Lindsay.
Constantine was born in New York City into the house of Sidamon-Eristavi, claiming descent from the medieval kings of Aragvi.
He was the son of Prince Simon Sidamon-Eristoff, a Georgian military officer, who emigrated to the United States after the Bolsheviks invaded Georgia in 1921, and Anne Tracy, a descendant of John Bigelow, an American diplomat in the mid-19th century.
Beginning with his appointment by Governor Malcolm Wilson of New York in 1974–1989 he served as a member of the Metropolitan Transportation Authority.
Since then, AFG has been working toward its mission to provide practical humanitarian assistance to the people of Georgia in order to improve educational, economic, social, medical, and environmental conditions.