10th dan Aikido sensei
Koichi Tohei - 10th dan - officially ratified by the Aikikai in 1970 and a certificate issued. (10th dan certificate number 1)
Michio Hikitsuchi - 10th dan - "unofficially awarded" 10th Dan by O Sensei. No certificate was issued.
Seiseki Abbe - 10th Dan - given verbally by O Sensei - Officially 8th Dan
Minoru Mochizuki - 10th dan - given by the IMAF in 1979
Yoshio Sugino - 10th dan - by virtue of being Katori Shinto Ryu headmaster. 10th dan given by IMAF
Rinjiro Shirata - 10th dan - given post mortem by the Aikikai.
Gozo Shioda - 10th dan - given by the IMAF. Given 9th dan by O Sensei.
Osawa sensei - 10th dan - after his death in 26.05.91, given post mortem by the Aikikai.