The Greek B Basket League, or Greek B Basketball League (Greek: Ελληνική Β Μπασκετ Λιγκ), is a national basketball league in Greece.

It is the 3rd-tier level of the basketball league system in Greece, and was founded in its current form in 1986.

[1] It is organized by the Hellenic Basketball Federation (E.O.K.).

Originally, the league began in 1961, as the Greek National B Class Championship, and it was the 2nd-tier level of Greek basketball until 1986, when it was replaced in that capacity by the Greek A2 Basket League.

Under the current league format, a total of 45 clubs take part, which are separated into four groups that are based on geographical criteria.