Family name Otsuka (オオツカ 
, Otsuka 
, Отсука 
) , all around the world, is quite a rare surname. The last name Otsuka is habitual in U.S. Virgin Islands, where it is quite a common surname, Singapore, where it is quite a rare surname, and Hong Kong. Not in comparison with a country's population, it most frequently occurs in Japan, Brazil, and the United States. More frequently, Otsuka is the forename as well as the last name.
| VARIANT | COUNTRY |
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| オオツカ | Japan |
| Otsuka | Brazil, Japan, Indonesia, United States, China |
| Отсука | Russia |
| t. r. otsuka garden designer (b. 1868) |
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| james otsuka American activist, US (b. 1921) |
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| kenju otsuka Japanese engineer and physicist (b. 1946) |
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| koichi otsuka botanist (b. 1951) |
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| ryuichi otsuka Senior Writer - The Yomiuri Shimbun (b. 1954) |
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| luis otsuka PE (b. 1951) |
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| julie otsuka writer, US (b. 1962) |
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| michael otsuka American philosopher, US (b. 1964) |
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| osamu otsuka researcher (ORCID 0000-0002-7484-1166) |
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| h. otsuka researcher ORCID ID = 0000-0002-5740-5995 |
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| takao otsuka researcher |
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| shigemi otsuka researcher |
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| yuta otsuka researcher |
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| haruna otsuka researcher (ORCID 0000-0001-9346-2658) |
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| hirokuni otsuka researcher (ORCID 0000-0003-2480-468X) |
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