Shūōshi Mizuhara (水原秋桜子; October 9, 1892 – 1981)[1] was a Japanese haiku poet and physician.

Shūōshi graduated with an MD from Tokyo University in 1926, specializing in obstetrics and gynaecology.

[2] Following World War II, Shūōshi gave up his medical practice to focus on poetry.

[3] Shūōshi's father unsuccessfully attempted to discourage his son's interest in literature.

The next year, he wrote a romantic manifesto that served as his exit from Hototogisu, "Truth in Nature and Truth in Literature", where he wrote:[2][3][4] If the whole aim of haiku writing were to grasp 'truth in nature,' the poet would need no assiduous study to gain new knowledge, no constant endeavour to enrich his mind.