International Aikidō umbrella organisation based in Tokyo (led by the descendants of the founder Morihei Ueshiba)
The Aikikai Foundation (Japanese: 財団法人合気会 Zaidan Hōjin Aikikai) is the original and world's largest organisation for the Japanese martial art of Aikidō. It was officially recognised by the Japanese government in 1940. The foundation describes itself as a parent organisation for the development and dissemination of aikido in the world. (Wikipedia)