Venerable Daesan (Kim, Daegŏ, 1914~1998) was the third Head Dharma Master of Won Buddhism who succeeded Venerable Chŏngsan’s Dharma seat.

During his 33 years as the Head Dharma Master, he made great efforts to establish the foundation of overseas missions, and especially emphasized the training of mind practice, and vowed that together we would eliminate poverty, and ignorance, and disease from the world. In particular, he had a strong interest in the world peace movement through inter-religious cooperation and the establishment of United Religions.

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While he raised the status of Won Buddhism to one of the major religions in Korea, he prepared its basis for being a world religion. He also published several books about mind practice including An Explanatory Diagram for the Practice of The Doctrine of Won Buddhism and The Essentials of The Chŏngjŏn(The Principle Book of Won Buddhism).