Michalis Giannatos (Greek: Μιχάλης Γιαννάτος; 11 July 1941 – 17 September 2013), alternatively spelled as Michael Yannatos, was a Greek actοr.

Ηe was born in (Istanbul), Turkey. He left the city for Greece in 1964 during the long expulsion of Istanbul Greeks.

He studied in Konstantinos Demopoulos' school of drama and first appeared as a professional actor in Georgios Zervoulakos' film Oi stigmatismenoi (Greek: Οι στιγματισμένοι) in 1966. When still a student, he participated in the theatrical play Capetan Michalis (Greek: Καπετάν Μιχάλης) next to Manos Katrakis.

During his long cinematic career, he appeared in close to 100 films, television series and plays. He was a regular in Theodoros Angelopoulos films since he was one of the director's favorite actors. After Megalexandros (Greek: Μεγαλέξανδρος) in 1981, Angelopoulos was always calling him to play in his movies.

He was fluent in five languages; Greek, Turkish, French, Italian and Spanish. Due to that, he appeared in many international productions, including Midnight Express, Captain Corelli's Mandolin, Munich and more.