Constantin Antoniade (16 August 1880 – 19 July 1954) was a Romanian jurist, writer, historian, philosopher and diplomat of ethnic Greek heritage.

After attending the city's Matei Basarab High School, he studied at the University of Bucharest, graduating with a law degree in 1902 and one in philosophy in 1903.

He went on to obtain a Ph.D. in philosophy in 1907, with thesis Iluziunea realistă written under the supervision of Constantin Rădulescu-Motru.

After the Communist regime took power in Romania, Constantin Antoniade received the authorization from Iuliu Maniu and Dinu Brătianu to make contacts in the western countries on behalf of the Romanian Liberal Party and the National Peasants' Party.

The other members of the committee were Raoul Bossy, Mihai Răuț and Dan Geblescu.