Family name 三原 (Mihara 
, 三原 ) , across the world, is a rare surname. The family name 三原 is habitual in Japan, where it is a rare surname, Singapore, and Brazil, where it is a very rare surname. In absolute terms, it most frequently occurs in the United States, Brazil, and Japan. Likewise, 三原 is the forename as well as the last name.
| 三原葉子 Japanese actress (1933-2013), JP (b. 1933) |
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| 三原佐知子 Japanese singer, JP (b. 1939) |
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三原舞依 Japanese figure skater, JP (b. 1999) |
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| 三原健一 Japanese teacher, JP (b. 1950) |
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| 三原正 Japanese boxer, JP (b. 1955) |
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| 三原正人 Japanese judoka, JP (b. 1959) |
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| 三原光尋 Japanese film director, JP (b. 1964) |
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| 三原智子 Japanese teacher, JP |
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| 三原康司 member of Frederic, JP (b. 1990) |
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| 三原遥 Japanese baseball player, JP (b. 1994) |
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| 三原大樹 Japanese actor, JP (b. 1997) |
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