Kosai can stand for:
*
Hiroki Kosai, 20th-century Japanese astronomer
*
Kosai, Shizuoka, Japan, a city
*
Kōsai, a disciple of Hōnen of the Jōdo Shū Buddhist sect
*
Kosai river, near Kharagpur in the Indian state of West Bengal
* Count
Kosai Uchida (or Uchida Yasuya), 19th-20th-century Japanese statesman and diplomat
*
Wiang Kosai, a national park in the Phrae and Lampang provinces of Thailand
* Kosai or
koose, an African pea fritter
See also
*
Kozai (disambiguation) Kozai may refer to:
*Kozai-Lidov mechanism, a dynamical phenomenon in celestial mechanics
*3040 Kozai, an asteroid
Persons with the surname Kozai
*Yoshihide Kozai (1928–2018), Japanese astronomer
*Kazuteru Kozai (born 1986), Japanese badminton ...
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