Costache Antoniu (Romanian pronunciation: [kosˈtace anˈtonju]; 1900–1979) was a Romanian stage and film actor.

[1][2] He graduated in 1926 from the Conservatory of Dramatic Art in Iași.

He acquired his reputation at the National Theatre Bucharest, where he carried out a rich activity.

[2] Between 1955 and 1970 Antoniu was rector of the Institute of Theater and Cinematography in Bucharest.

[2] This Romanian biographical article is a stub.