Kostas Manoussakis (Greek: Κώστας Μανουσάκης; January 1929 – 26 August 2005) was a Greek film director and screenwriter. His 1964 film Treason was entered into the 1965 Cannes Film Festival and his 1966 film The Fear was entered into the 16th Berlin International Film Festival.

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He was a Greek filmmaker and writer who gained critical recognition in the 1960s before withdrawing from public life.
He is best known for directing the films Treason (1964) and The Fear (1966), both of which competed at major European film festivals.
After directing three feature films, he largely exited the industry and lived in isolation for the remainder of his life.