Tendai-zasu (head priest of the Tendai sect) is a post that serves as the resident priest of Enryaku-ji Temple on Mt. Hiei, the head temple of the Tendai sect, exercising general supervision over all of its sub-temples.
天台座主（てんだいざす）は、日本の天台宗の本山である比叡山延暦寺の貫主（住職）で、天台宗の諸末寺を総監する役職。