Smyth has represented Canada in international competition on numerous occasions. He has won gold medals at the 1995 World Junior Championship, 2002 Winter Olympics, 2003 and 2004 World Championships, and 2004 World Cup. Having served as captain of Canada's World Championship team for a team record six years (2001–05 and 2010), he has earned the nickname "Captain Canada." Smyth is also Canada's all-time leader in games played at the tournament. He played a record 90 games for Hockey Canada while becoming the only player in hockey history to win gold in all of Olympics, World Cup, World Championships, World Juniors, and Spengler Cup. He will be inducted into the IIHF Hall of Fame in 2020.