Yun Kwae-byung (Hanja: 尹快炳, also spelled "Yoon Kwe-byung" and "Yoon Kwei-Byung", 1922–2000) was a Korean martial artist and an notable figure in history of modern Japanese and Korean martial arts. He was the head of the influential Kanbukan Dojo, that would pioneer and full contact karate, as well as being the first headmaster of Jidokwan school, one of the original kwans that would eventually unite and found Taekwondo. In Japan, his name is often transliterated as "In Giei", "In Gekka", "Yun Gekka" or other close variations.