Nishioka Tsuneo (西岡常夫) (7 February 1924 – 8 February 2014) - was a Japanese martial artist and the founder of the Shinto Muso-ryu Jōdō group Sei Ryu Kai (清隆会). As of 2012, Nishioka had retired from active teaching although several of his menkyo kaiden continue to transmit his teachings.
Nishioka Tsuneo started his training in Shinto Muso Ryu (神道夢想流) under Shimizu Takaji (清水隆次) in 1938 at the age of 14. Nishioka studied constantly with Shimizu Takaji until Shimizu’s death in 1978. Nishioka received his first scroll of transmission (Oku-iri) in 1941, the second (Shomokuroku) in 1943 and (Gomokuroku) in 1966. In 1975 Nishioka received his Menkyo Kaiden or "license of full transmission" from Shimizu Takaji. 
Nishioka created the Sei Ryu Kai in honor of Shimizu Takaji after his death by using the kanji found in his name to form Sei (or Shi) 清；Ryu 隆 –and Kai 会, which could be interpreted as "Shimizu Takaji’s" group.
According to Nishioka Sensei, a Mokuroku is not a qualification and is an expression of the will of the predecessors to convey "their hopes for the future", and it is still in the middle of the path.
Sei Ryu Kai Menkyo Kaiden of Nishioka Sensei
- Mitsuo Hamaji
- Michio Kaneda
- Kazuhiko Ishiko
- Toshimoto Tamiya
- Phillip Relnick
- Pascal Krieger
- Hiroaki Ishida
- Katsuhiko Arai
- Taisuke Watanabe
- Hiroshi Yamada
- Masami Kitta.
N.B. Listed in chronological order in line with Japanese etiquette and sourced from Nishioka Sensei's own "My Wish" for his successors, dated 12 September 2010. 
- "Nishioka Shishou – SMRJ Personal History".
- Tsuneo, N. (3 December 2006). Personal interview. Conducted by the Ai-jo-kai in Nagoya, Japan.
- "Nishioka Tsuneo (西岡常夫先生) - Jōdō Jikai - Jōdō Self Reflection".
- "Ranking Systems in Modern Japanese Martial Arts: Modern vs. Classical by Donn F. Draeger".
- "Levels of training and their respective teachings - Training Assistants (Okuiri, Shomokuroku, Gomokuroku)".
- "Looking to future section of Seiryukai".