The 2017 World Junior Ice Hockey Championships was the 41st edition of the Ice Hockey World Junior Championship. The main tournament was co-hosted by the Bell Centre in Montreal, Quebec and Air Canada Centre in Toronto, Ontario. This was the 14th championship that Canada had hosted. Montreal and Toronto also jointly hosted the 2015 edition. The tournament consisted of 30 games between 10 nations.

The 2016 World Junior Ice Hockey Championship was the 40th Ice Hockey World Junior Championship. It was hosted in Helsinki, Finland. It began on December 26, 2015, and ended with the gold medal game on January 5, 2016. This marked the sixth time that Finland has hosted the WJC, and the hosts defeated Russia 4–3 in overtime to win their fourth title in history and second in the last three years. Belarus was relegated to Division I-A for 2017 by merit of their tenth-place finish, while Finnish right winger Jesse Puljujärvi earned MVP and top scorer honors.