The 2017 Memorial Cup (branded as the 2017 Mastercard Memorial Cup for sponsorship reasons) was a four-team, round-robin format tournament held at the WFCU Centre in Windsor, Ontario from May 19–28, 2017. It was the 99th Memorial Cup championship, which determined the champion of the Canadian Hockey League (CHL). The tournament was hosted by the Windsor Spitfires, who won the right to host the tournament over undisclosed competition. Other participating teams were the OHL champion Erie Otters, the QMJHL champion Saint John Sea Dogs, and the WHL champion Seattle Thunderbirds. The tournament ended with the Windsor Spitfires winning their third Memorial Cup, defeating the Erie Otters 4–3 in the championship final.