The 2017–18 Gamma Ethniki was the 35th season since the official establishment of the third tier of Greek football in 1983. It started on 1 October 2017. After matches were completed in the eight groups, the top team in each group qualified for a playoff round of two groups, to determine which four teams would be promoted to the Football League.
97 teams were divided into eight groups according to geographical criteria.
Panelefsiniakos, AO Chania, AEL Kalloni, Panthrakikos, Eordaikos, A.E. Istiaia, Mavroi Aetoi Eleftherochori, Amvrakia Kostakioi, APO Kanaris Nenita, Pyrsos Grevena, AO Syros, Poseidon Neoi Poroi and AO Polykratis Pythagoreio withdrew from the league before the group draw.
Group 1
Teams
Team Location Last season Nestos Chrysoupoli Chrysoupoli Doxa Proskinites Proskinites Orfeas Xanthi Xanthi Kavala Kavala Apollon Paralimnio Paralimnio A.E. Didymoteicho Didymoteicho Doxa Neo Sidirochori Neo Sidirochori Megas Alexandros Xiropotamos Xiropotamos Aetos Orfano Ofrynio Elpis Skoutari Skoutari promoted as Amateur Cup finalist Megas Alexandros Karperi Karperi Aris Avato Avato
Standings
Group 2
Teams
Team Location Last season Pierikos Katerini APE Langadas Langadas Kampaniakos Chalastra AO Kardia Kardia Almopos Aridea Aridaea Naoussa Naousa Makedonikos Efkarpia Agrotikos Asteras Evosmos Kilkisiakos Kilkis Edessaikos Edessa Aris Palaiochori Palaiochori Megas Alexandros Trikala Trikala Imathia Philippos Alexandreia Alexandreia AE Karitsa Karitsa Iraklis Thessaloniki
Standings
Group 3
Teams
Team Location Last season Thesprotos Igoumenitsa Tilikratis Lefkada Ethnikos Filippiada Filippiada Makedonikos Foufas Foufas Kastoria Kastoria Doxa Kranoula Kranoula Asteras Parapotamos Parapotamos Skoufas Kompoti Kompoti Panlefkadios Lefkada A.E. Lefkimmi Lefkimmi Neos Amfilochos Amfilochia AEP Karagiannia Karagiannia Ermis Amyntaio Amyntaio
Standings
Group 4
Teams
Team Location Last season Niki Volos Nea Ionia Volos Olympiacos Volos 1937 Volos Rigas Feraios Velestino Thiva Thiva Opountios Martino Achilleas Farsala Farsala Digenis Neochori Oichalia Almyros Almyros APOK Velouchi Karpenisi Asteras Itea Itea APO Amvrysseas Distomo AO Sellana Sellana Volos Volos
Standings
Group 5
Teams
Team Location Last season Achaiki Kato Achaia PAO Varda Varda Asteras Amaliada Amaliada Tsiklitiras Pylos Pylos Panarkadikos Tripoli Kalamata Kalamata Zakynthos Zakynthos Paniliakos Pyrgos Pallixouriakos Lixouri Diagoras Vrachnaiika Vrachnaiika Asteras Vlachioti Vlachioti Leonidio Leonidio
Standings
Group 6
Teams
Team Location Last season Ionikos Nikaia Ethnikos Piraeus Piraeus Proodeftiki Nikaia Rodos Rhodes Ialysos Ialysos Zevgolateio Zevgolateio A.O.Loutraki Loutraki Keratsini Keratsini Pelopas Kiato Kiato Diagoras Rhodes Enosi Panaspropyrgiakou Doxas Aspropyrgos
Standings
Group 7
Teams
Team Location Last season Enosi Ermionida Kranidi Panargiakos Argos Aiolikos Mytilene Chalkida Chalkida Panthiraikos Santorini Thyella Rafina Rafina (Diastavrosi neighborhood) Triglia Rafina Rafina Ermis Kiveri Kiveri Aittitos Spata Spata Diagoras Agia Paraskevi Agia Paraskevi, Lesbos Tamyniakos Aliveri
Standings
Group 8
Teams
Team Location Last season Fostiras Tavros Agios Ierotheos Peristeri A.E. Kifisia Kifisia Ilisiakos Zografou Ermis Zoniana Zoniana Atsalenios Heraklion (Atsalenio neighborhood) Irodotos Nea Alikarnassos Egaleo Egaleo OF Ierapetra Ierapetra AE Mylopotamos Mylopotamos Palaiochora Palaiochora
Standings
Promotion Playoffs Group 1
Group 2
References