Kim Yoon-sang (Korean: 김윤상; (1934–2021) was the most senior of students (achieving the rank of 9th dan) of the founder of hapkido, Choi Yong-sool (Korean: 최용술), from the hapkido founder's latter years.

[1] He began his study of Hapkido in the early 1960s under Master Chang Gedo, eventually reaching a grade of 5th Dan within the Korea Hapkido Association.

In 1973, along with his friend Lee Yong-soo (Korean: 이용수), Kim travelled to Daegu to train under the founder of hapkido, Choi Yong-sool.

Thereafter Kim and Lee frequently travelled to Daegu to receive private lessons from Choi first at his school and then after it closed in 1976 in any available space.

At the request of Choi Yong-sool, Kim and Lee opened up a school for training (see: dojang) in their hometown of Geumsan in 1978.