Motobu-ryū (本部流) is a school of karate founded by Choki Motobu in 1922. The official full name is Nihon Denryu Heiho Motobu Kenpo ("Japan's traditional tactics Motobu Kenpo").
Motobu Udun-di (本部御殿手), a Motobu family style of Karate, is also sometimes called Motobu-ryu or Motobu-ryu Udundi. It is a combination of the native Okinawan martial arts Te (an earlier name for Karate), Okinawan kobudō and Ryukyuan Dance.
Chosei Motobu is the inheritor of both Motobu-Ryu (his father's art) and Motobu Udundi (the art of his uncle, Choyu Motobu).