2018–19 Greek Basket League
The 2018–19 Greek betshop.gr Basket League was the 79th season of the Greek Basket League, the top-tier level professional club basketball league in Greece. The season started on 7 October 2018, and ended on 15 June 2019. Panathinaikos OPAP won the Greek Basket League championship for a record 37th time, after beating Promitheas Patras 3–0 in the [|Finals].
The season infamously featured a major feud between traditional rivals Panathinaikos and Olympiacos over refereeing decisions in the 2019 Greek Cup semifinals game between the two teams, which eventually culminated in Olympiacos also forfeiting their playoffs, and being relegated to the second tier level 2019–20 Greek A2 Basket League for the first time since 1964.
Teams
Promotion and relegation
;Relegated from the Greek betshop.gr Basket League 2017–18 season:Koroivos and Trikala Aries were relegated, after finishing in the last two places in the 2017–18 season.
;Promoted from the A2 Basket League 2017–18 season:
The first club that was promoted was Peristeri, which won its third A2 Basket League championship, after finishing with a 29–1 record, in the 2017–18 season. The second team to be promoted was Holargos, as the winners of the promotion play-offs. Holargos defeated Apollon Patras 3–0, in the finals of the play-offs.
Locations and arenas
| Club | Location | Arena | Capacity | |
| AEK | Athens | OAKA Indoor Hall | 62 | |
| Aris | Thessaloniki | Alexandrio Melathron | 65 | |
| Holargos | Athens | Antonis Tritsis Indoor Hall | 1 | |
| Ifaistos Lemnos | Myrina | Nikos Samaras Indoor Hall | 1 | |
| Kolossos H Hotels | Rhodes | Venetoklio Indoor Hall | 13 | |
| Kymi | Chalkida | Tasos Kampouris Kanithou Indoor Hall | 3 | |
| Lavrio Aegean Cargo | Lavrio | Lavrio Indoor Hall | 4 | |
| Olympiacos | Piraeus | Peace and Friendship Stadium | 66 | |
| Panathinaikos OPAP | Athens | OAKA Indoor Hall | 69 | |
| Panionios | Athens | Sofia Befon Indoor Hall | 50 | |
| PAOK | Thessaloniki | PAOK Sports Arena | 62 | |
| Peristeri Vikos Cola | Athens | Peristeri Arena | 23 | |
| Promitheas Patras | Patras | Dimitris Tofalos Arena | 3 | |
| Rethymno Cretan Kings | Rethymno | Melina Merkouri Sports Arena | 9 |
Personnel and Sponsorship
| Club | Head coach | Captain | Kit manufacturer | Main shirt sponsor |
| AEK |  Luca Banchi |  Dušan Šakota | Fila | Betshop.gr |
| Aris | Ioannis Kastritis | Lefteris Bochoridis | Spalding | - |
| Holargos | Aris Lykogiannis |  Toarlyn Fitzpatrick | BillyBro | BoConcept |
| Ifaistos Limnou | Sotiris Manolopoulos | Sotirios Manolopoulos | GSA Sport | - |
| Kolossos H Hotels | Stergios Koufos | Ioannis Georgallis | Fila | Aegean Airlines |
| Kymi | Isidoros Koutsos | Stavros Toutziarakis | Nickan | - |
| Lavrio Aegean Cargo | Christos Serelis | Michalis Perrakis | Athios | Advanced Hair Clinics |
| Olympiacos |  David Blatt | Vassilis Spanoulis | Nike | bwin |
| Panathinaikos OPAP | Rick Pitino | Nick Calathes | Adidas | Pame Stoixima |
| Panionios | Vassilis Fragkias | Nikos Diplaros | Nickan | - |
| PAOK | Ilias Papatheodorou | Vangelis Margaritis | Erreà | Watt+Volt |
| Peristeri Vikos Cola | Argyris Pedoulakis | Panagiotis Vasilopoulos | Flex One | Vikos Cola |
| Promitheas Patras | Makis Giatras | Nikos Gkikas | Athios | Medfrigo |
| Rethymno Cretan Kings | Vangelis Ziagkos | Antreas Christodoulou | Nickan | - |
Head coaching changes
Regular season
League table
Results
Playoffs
The eight highest ranked teams in the regular season qualified for the playoffs. All series will be played with a 2–2–1 format.Bracket
Quarterfinals
Semifinals
Third place series
Finals
Final standings
NOTES:- Holargos was faced financial problems. The club's registered place in the top-tier Greek Basket League was purchased by Kolossos Rodou, which thus avoided being relegated.
- Kymi was faced financial problems. The club's registered place in the top-tier Greek Basket League was purchased by Lavrio, which thus avoided being relegated.
- Olympiacos was relegated on 22 May 2019, following an extraordinary meeting of the Hellenic Basketball Clubs Association's Board of Directors. This was due to the club refusing to play in its playoff series against Panathinaikos, which marked its third forfeited game of the season, and which resulted in an automatic relegation, per league rules. The league also stripped the team of all of its season wins, as a further punishment.
Clubs in European-wide competitions