The 2008–09 Tour de Ski was the third edition of the Tour de Ski and took place from 27 December 2008 until 4 January 2009.

The race kicked off in Oberhof, Germany, and concluded with the Final Climb stage in Val di Fiemme, Italy.

The men's event was 102 km, won by Dario Cologna of Switzerland; and the women's event was 60 km, won by Virpi Kuitunen of Finland.

According to the position in the race, the skiers achieved bonus seconds for sprints, and bonus points for intermediate points in mass start races.

29 December 2008, Prague - Sprint 31 December 2008, Nové Město na Moravě - Individual start 1 January 2009, Nové Město na Moravě - Sprint 3 January 2009, Val di Fiemme, Italy - Mass start 4 January 2009, Val di Fiemme - Pursuit