McDavid played for Canada at the 2014 World Junior Championship where the team finished fourth. He also represented Canada in the 2015 World Junior Championship in Toronto and Montreal where they won gold on January 5, 2015. He served as one of the two alternate captains for the team. In the 7 games McDavid played at the tournament he scored 3 goals and a tournament-leading 8 assists. He was named to the tournament all-star team.