The Professional Soccer Referees Association represents professional soccer officials / referees in the professional North American leagues of the United States of America and Canada. Representing soccer officials of Major League Soccer (MLS), the United States Soccer Federation (USSF), the Canadian Soccer Association (CSA), Women's Professional Soccer (WPS) and the United Soccer Leagues (USL). How to become a professional referee. How to become a soccer official. Representing soccer officials of Major League Soccer (MLS), the United States Soccer Federation (USSF), the Canadian Soccer Association (CSA, Women's Professional Soccer (WPS) and the United Soccer Leagues (USL). Professional referees in the United States. Professional referees in the USA. Professional referees in Canada. Soccer officials. Soccer Referees. MLS Referees. WPS Referees. WUSA Referees. USL Referees. PDL Referees. Home About Us Frequently Asked Questions Partners Training & Downloadable Files