John Kristian Dahl (born March 27, 1981) is a Norwegian cross-country skier who has competed since 2001.
His best World Cup finish was second in three times between 2003 and 2008, all in the sprint event.
Dahl is third in the 2008-09 World Cup sprint standings entering the FIS Nordic World Ski Championships 2009 in Liberec, Czech Republic.
On 2 March 2014, he won the annual long distance cross-country ski race Vasaloppet in Mora, Sweden as the fourth ever Norwegian skier to win.
On 6 March 2016, he won it the second time with the time of 4:08:00 and on 5 March 2017, for the third time with the time 3:57:18.On 10 April 2016, he also won the men's edition of Nordenskiöldsloppet.On 2 April 2019, he announced his retirement from cross-country skiing.