Kosaka (小坂, 小阪 or 古坂) and Kōsaka (高坂 or 向坂, also spelled Kousaka) are two separate Japanese surnames, distinguished by the length of the vowel in the first syllable of each surname. They are sometimes spelled identically in romanisation due to omission of the macron in the latter surname. Notable people with these surnames include:

Fictional characters:

See also

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  • Kosaka, Akita (小坂町), town located in Kazuno District, Akita Prefecture, Japan