Gauldal Billag

Gauldal Billag AS, briefly known as Gauldal–Østerdal Buss AS, was a bus and freight transport company based in Røros, Norway. It traditionally served the Gauldal district in Trøndelag, with the municipalities of Røros, Holtålen and Midtre Gauldal, and buses from these areas to Oppdal and Trondheim.

The company was established as a merger of four bus and truck operators in 1964. Originally focused mostly on scheduled transport, it gradually focused more on freight and charter bus tours. It started a coach service from Røros to Trondheim in 1985, and from 1997 operated joint coach service between Trondheim and Oslo. It bought Østerdal Billag in 2000 and 2002.

TrønderBilene became a major shareholder in 2004, and gradually bought up the whole company. Gauldal Billag lost all its scheduled operations from 2013, when they were made subject to public service obligation. Gauldal and Østerdal merged, and the merged company was able to win contracts to operate in Gudbrandsdalen. Gauldal–Østerdal Buss mergeed with TrønderBilene on 26 August 2014.