Kreider scored six goals for the gold medal-winning United States World Junior Championship team in 2010. He was chosen to represent the United States once again at the 2011 World Junior Ice Hockey Championships, and led the team with four goals in six games as Team USA won the bronze medal. Two of his goals were scored in the bronze medal game, and he was named the USA's best player for that game. Kreider's ten goals in World Junior Championship play tied him with John LeClair and Mike Modano for third all-time among American players, behind just Jeremy Roenick's 13 and Brian Gionta's 11.