Marc-Antoine Gagnon (born March 6, 1991) is a Canadian freestyle skier.

Gagnon represented Canada at the 2014 Winter Olympics in the moguls event.

He placed fourth, narrowly losing to Russia's Alexandr Smyshlyaev for the bronze medal.

Gagnon won a bronze as part of a Canadian podium sweep in the dual moguls event at the 2015 World Championships.

This biographical article relating to freestyle skiing in Canada is a stub.