The Organization of Communist Internationalists of Greece–Spartacus (Greek: Οργάνωση Κομμουνιστών Διεθνιστών Ελλάδας - Σπάρτακος (ΟΚΔΕ-Σπάρτακος)) is a Trotskyist group in Greece.

In the 2007 Greek legislative election it was a central component in the United Anti-Capitalist Left electoral coalition.

In the Greek legislative election, 2012 it broke with the Executive Bureau of the Fourth International which decided to switch support from Antarsya to Syriza.

According to the section's Central Committee: "Unfortunately we realize with anguish that the Fourth International is not capable of playing the role it should play in this historical period and we wonder where we are going…" [2] The Greek section has since helped to form the "Revolutionary Marxists" faction in the Fourth International.

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