Campbell represented the United States numerous times over the course of his career, but his most memorable youth international competition was the 2010 World Junior Ice Hockey Championships where he backstopped the Americans to an upset victory over the host Canadians in the gold medal game. For his efforts, he was named Goaltender of the Tournament. Following this tournament, he was again invited to the USA Hockey National Junior Evaluation Camp prior to the 2012 IIHF World Junior Championship.