The 2017–18 Dutch Basketball League (DBL) was the 58th season of the Dutch Basketball League, the highest professional basketball league in the Netherlands. The regular season started on 7 October 2017 and ended 21 April 2018. Donar is the defending champion. The playoffs started on 1 May and ended 29 May 2018. Donar captured its seventh championship, its third in a row and fourth in fifth years, after defeating ZZ Leiden in the finals.