Representing Canada internationally on four occasions, Cammalleri won bronze and silver medals at the 2001 and 2002 World Junior Championships respectively. He was named the tournament's best forward in 2002. He won a gold medal at the 2007 Men's World Ice Hockey Championships. An all-star in college and the American Hockey League, Cammalleri played in the "Cold War", an outdoor game that set a then world attendance record in 2001. He has also been recognized for his involvement in charitable efforts supporting children and the military.