This paper is offered as a contribution to the analysis of one of the most significant episodes in Greece’s modern history, namely the Colonels’ Coup. The unexplored aspect on which it intends to throw light involves the examination of the widespread hypotheses regarding foreign complicity in the coming to power of the Greek Colonels. It seeks to account for the extent to which foreign powers had any foreknowledge of the coup, and also aspires to investigate the possibility of foreign involvement in the coup’s implementation.