As a junior, Spezza represented Canada's national junior team three consecutive years. He made his debut at the 2000 World Junior Championships, becoming just the third 16-year-old to make the team in Team Canada history, after Wayne Gretzky and Eric Lindros (this feat was also accomplished the same year by defenceman Jay Bouwmeester and Sidney Crosby in 2004). Spezza contributed 2 assists in 7 games as Canada captured a bronze medal. He returned in 2001 for a second consecutive bronze medal, while improving to three goals and three assists. Spezza made it to the gold medal game with Canada in his third and final World Junior appearance in 2002, but lost to Russia to earn the silver.