The 2017–18 Tour de Ski was the 12th edition of the Tour de Ski, part of the 2017–18 FIS Cross-Country World Cup.

The World Cup stage event began in Lenzerheide, Switzerland, on December 30, 2017, and ended in Val di Fiemme, Italy, on January 7, 2018.

The cups were defended by Heidi Weng (Norway) and Sergey Ustiugov (Russia).

30 December 2017, Lenzerheide, Switzerland 31 December 2017, Lenzerheide, Switzerland 1 January 2018, Lenzerheide, Switzerland 3 January 2018, Oberstdorf, Germany 4 January 2018, Oberstdorf, Germany 6 January 2018, Val di Fiemme, Italy 7 January 2018, Val di Fiemme, Italy The race for "Fastest of the Day" counts for 2017–18 FIS Cross-Country World Cup points.

No bonus seconds were awarded on this stage.