The H.E.F. cooperates harmoniously with the following similar societies in Greece and abroad: the International Federation of Classical Studies Societies (F.I.E.C.)

1. the European Association of Classics and Culture Teachers' Societies EUROCLASSICA.
2. The Hellenic Linguistic Heritage ( E.G.K.).
3. the Panhellenic Union of Philologists ( P.E.F.).
4. The Organisation for the Internationalisation of the Greek Language ( O.D.E.G.).
5. The Association of Cypriot Philologists "STASINOS".
6. the Philological Association "PARNASSOS".
7. the Spanish Society of Classical Studies (Sociedad Español des Estudios Clasicos).
8. the Cultural Centre of Delphi.