The Greek League Cup, a now defunct football competition, took place only once, in the 1989-90 season. AEK, is the only winner of the League Cup, by beating Panionios (3-3 and 4-2 on penalties), Aris (5-2), Levadiakos (0-0 and 1-0) and Olympiacos (3-2 at the final of the Athens Olympic Stadium, on June 2, 1990).
References
Greek League Cup Wikipedia(Text) CC BY-SA