1977–78 National Basketball League season

The 1977–78 Guinness National Basketball League season was the sixth season of the National Basketball League.

The league was sponsored by Guinness and the number of teams participating remained at ten. The Loughborough team moved to Leicester, while Exeter and Stockport replaced the Avenue and Durham teams.

The Crystal Palace team completed a third consecutive double of National League and Cup. There were no playoffs for the League during this era and the previous system of awarding one point to losing teams in the league table was scrapped.