The 2017–18 Greek A2 Basket League was the 32nd season of the Greek A2 Basket League, the second-tier level professional club basketball league in Greece. It was the third season with the participation of 16 teams. Playoff and play out games were also held, for a third consecutive season. Peristeri clinched the championship four games before the end of the regular season.[1] Together with the playoffs winners Holargos, they were promoted to the 2018–19 Greek Basket League.
In the promotion playoffs, best-of-five playoff series were played. The higher-seeded team hosted the Game 1, Game 2 and Game 5 (if necessary) at home.