Chujiro Hayashi, Japanese physician (b. 1880)
Chujiro Hayashi (林 忠次郎, Hayashi Chūjirō, 15 September 1880 – 11 May 1940), a disciple of Mikao Usui, played a major role in the transmission of Reiki out of Japan.

Hayashi was a naval physician and employed Reiki to treat his patients. He began studying with Usui in the early 1920s. He made his branch, Hayashi Reiki Kenkyu-kai in Tokyo, Shinano-machi while his master Usui was still alive, and has kept the way of Usui's teaching.

Hayashi initiated and trained Hawayo Takata and helped her bring Reiki to Hawaii. He also trained Chiyoko Yamaguchi, the founder of Jikiden Reiki.

In 1940, Hayashi committed seppuku, a Japanese form of ritual suicide.