The National Progressive Center Union (EPEK) (Greek: Εθνική Προοδευτική Ένωση Κέντρου, EPEK) was a Greek political party.It was established in 1949 by General Nikolaos Plastiras and attracted a following of disappointed Liberals and left-leaning democrats. It preached a message of national conciliation, which put it in conflict with the rightist establishment.