Seikichi Toguchi (渡口 政吉 Toguchi Seikichi?, May 20, 1917 in Naha City, Okinawa, Japan – August 31, 1998 in Tokyo) was the founder of Shorei-kan karate.
As a young boy, Toguchi learned the basic techniques of Okinawan Te from his father. In 1930, at the age of 15, he began his lifelong study of Gōjū-ryū karate at the dojo of Sekō Higa and later under Chojun Miyagi as one of his principal students. He studied under Higa for over 33 years and under Miyagi for more than 25 years, making his karate education unique. Toguchi was fortunate as Miyagi was a personal friend of Toguchi's father and so paid many visits to the family. At these times the conversation nearly always turned to karate and the discussions would go on till the early hours of the morning.
Toguchi continued his full-time study of karate until the beginning of World War II, when he was drafted into the army as an electrical engineer and stationed in Sumatra, Indonesia. In 1946 he returned to Okinawa to find a devastated people and homeland. Miyagi had lost three children and one of his senior students, Jinan Shinsato. Higa had lost his wife. Miyagi began teaching at the police academy and Higa moved in with Toguchi. At this time Higa also played matchmaker and introduced Toguchi to a young girl named Haruko, soon to be his wife.
In 1949, with the help of Toguchi, Higa opened up a new dojo and Toguchi was appointed Shihan. Before his death, Miyagi passed on all his advanced kata and teachings to Toguchi, one of the more important being kaisai no genri. This teaching explains how to unlock the hidden techniques of the koryu kata. In 1953, after the death of Miyagi, his senior students formed the Karate-Do Goju Association with Meitoku Yagi as chairman and Seikichi Toguchi as Vice Chairman.