1989–90 Courage League National Division Three

The 1989–90 Courage League National Division Three was the third full season of rugby union within the third tier of the English league system, currently known as National League 1. Each team played one match against the other teams, playing a total of eleven matches each. Following their relegation the previous season, London Scottish won all their eleven matches and won promotion with three matches remaining, to return to National Division Two. Wakefield finished second and were also promoted. London Welsh finished in last place and was relegated to Area League South for the following season.

Sponsorship
National Division Three is part of the Courage Clubs Championship and is sponsored by Courage Brewery