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. He became Junior World Champion in 2010.
He represented the sports clubs Mosvik IL and Strindheim IL.
All results are sourced from the International Ski Federation (FIS).