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
Yoshihide Kosai (or, more frequently, Yoshihide Kozai), 20th-century Japanese astronomer, discoverer of the periodic comet D/1977 C1 (D/Skiff-Kosai) and of the Kozai mechanism
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