Marielle Thompson is a Canadian freestyle skier specializing in ski cross. She is the 2014 Winter Olympic and 2019 World champion in women's ski cross, as well as a three-time FIS World Cup Crystal Globe winner as the top-ranked athlete in that discipline and the 2013 Junior World champion.

Ski cross is a skiing competition which incorporates terrain features traditionally found in freestyle skiing with courses which include big-air jumps and high-banked turns. In spite of the fact that it is a timed racing event, it is often considered a type of freestyle skiing. What sets ski cross apart from other alpine skiing disciplines is that it involves more than one skier racing down the course. Any intentional contact with other competitors like grabbing or any other forms of contact meant to give the competitor an advantage leads to disqualification.