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,[1] which eventually culminated in Olympiacos also forfeiting their playoffs.

[2] Koroivos[3] and Trikala Aries[4] were relegated, after finishing in the last two places in the 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.

1 Olympiacos refused to participate in their playoff series against Panathinaikos over refereeing disputes.