Justyna Maria Kowalczyk (born 19 January 1983) is a Polish cross country skier who has been competing since 2000.
Kowalczyk is a double Olympic Champion and a double World Champion.
She is also the only skier to win the Tour de Ski four times in a row and one of two female skiers, who won the FIS Cross-Country World Cup three times in a row (the other one being Finn Marjo Matikainen).
Kowalczyk holds the all-time record for the most wins in Tour de Ski with 14 competitions won and 29 podiums in total.
She also won the Vasaloppet women's edition in 2015.She is a member of cross country ski department of AZS AWF Katowice and is coached by Aleksander Wierietielny.