The Gråkallen Line is an 8.8-kilometre (5.5 mi) suburban tram line located in Trondheim, Norway. As the only remaining part of the Trondheim Tramway, it runs from the city centre at St. Olav's Gate, via the suburban area Byåsen to Lian. It is designated Line 9, and is served by six Class 8 articulated trams. After the closure of the Arkhangelsk tramway in 2004, it became the world's northernmost tramway system.

The Trondheim Tramway in Trondheim, Norway, is the world's most northerly tramway system, following the closure and dismantling of the Arkhangelsk tramways in Russia. It consists of one 8.8-km-long line, the Gråkallen Line, running from St. Olav's Gate in the city centre through Byåsen to Lian Station in Bymarka.