Surname Okayama (Okayama 
) , across the world, is a rare family name. The surname Okayama is habitual in Japan, where it is a rare surname, Brazil, where it is a very rare surname, and Poland. Measured by absolute frequency, the name is most common in Brazil, Japan, and the United States. Much less frequently, Okayama is the forename as well as the last name.
| sinya okayama Japanese interior designer, active late 20th century, JP (b. 1941) |
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| marcio okayama Brazilian composer (1971-), BR (b. 1971) |
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| takehito okayama herpetologist |
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| kaori okayama researcher (ORCID 0000-0002-5994-9670) |
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| tatsushi okayama researcher |
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| toshitsugu okayama researcher |
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| satoshi okayama researcher |
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| akira okayama researcher |
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| tomoko okayama researcher (ORCID 0000-0002-0293-7396) |
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| yoshimichi okayama researcher |
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| masanobu okayama researcher |
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