Tomas Northug (born 19 April 1990) is a Norwegian cross-country skier.

He was born in Mosvik Municipality, and is the middle brother of Petter Northug and Even Northug.

He won a World Cup victory in Otepää in January 2015.

All results are sourced from the International Ski Federation (FIS).

This biographical article relating to Norwegian cross-country skiing is a stub.