The Namboku Line (南北線, Nanboku-sen) is a rubber-tyred metro line in Sapporo, Hokkaido, Japan.

It is part of the Sapporo Municipal Subway system.

Its name literally means South-North Line, and it runs from Asabu Station in Kita-ku to Makomanai Station in Minami-ku.

The Namboku Line color on maps is green, and its stations carry the letter "N" followed by a number.

Platform edge doors are scheduled to be installed on all stations by 2014.