Seishi (written: 聖史, 正士, 正史 or 誠志) is a masculine Japanese given name. Notable people with the name include:
- (born 1945), Japanese jurist
- (1902–1974), Japanese physicist
- (born 1974), Japanese manga artist
- (1902–1981), Japanese writer
- (1871–1948), Japanese spiritual leader
- , Japanese haiku writer
Other uses
- The Japanese term for Worship of the living
See also
- Mahasthamaprapta