The Kodokan - English language site of the World Headquarters of Judo in Tokyo, Japan.
The International Judo Federation (IJF) - The international governing body of competitive judo and organizer of international events and tournaments.
Judo Canada - The national governing body of the sport in Canada. It handles all black belt promotions.
Yudansha (Black Belt) and Mudansha/Kyu (Coloured Belt) grading guidelines from Judo Canada.
Judo Ontario - The provincial governing body of the sport in Ontario. There are useful links to upcoming events and tournaments.
Judo Quebec - The provincial association of Quebec. In French.