Based on the strong performance in 2009 World Championships and in the NHL regular season leading up to the Olympics, Mason was selected as a reserve by Team Canada for the 2010 Winter Olympics as a stand-by goaltender should an injury occur. He would play as the starting goaltender at the 2010 World Championships in Germany, where they lost against Team Russia in the quarter-finals. Mason also played for Team Canada at the 2013 Spengler Cup.