Seigo Tada (多田 正剛, Kyoto, Japan, 1922–1997) (8th Dan) was the founder of Goju-Ryu Seigokan Karatedo.

During the war, he was a member of the "Tokotai" Battalion with suicide identical missions to the "Kamikaze" (Divine Wind).

After the Second World War (1939–1945), he made testing for movie actor, together with Toshirō Mifune, but soon abandoned this career.

In order to expand Goju-Ryu Seigokan and to transform Karate as an Olympic Sport, he traveled abroad and sent instructors, creating Associations (Branches) of Seigokan in Hong Kong, Macau, Brazil, Portugal, United States, Canada, Australia, Italy, Philippines, Singapore, India and Sri Lanka.

After his sudden death by myocardial infarction in 1997, his wife Michiko Okamoto, succeeded him as President of Seigokan All Japan Karate-Do Association (SAJKA).