Surname Klaassen (Klaassen 
, Классен 
, קלאסן 
) , in the entire world, is a common family name. The surname Klaassen is characteristic of Netherlands, where it is quite a common surname, Estonia, and Kazakhstan, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Netherlands, Germany, and Russia.
| j.a. klaassen (b. 1843) |
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leo klaassen Dutch economist and university professor (1920-1992), NL (b. 1920) |
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| mihkel klaassen Estonian judge and politician, EE (b. 1880) |
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mait klaassen Estonian politician, EE (b. 1955) |
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mark klaassen American lawyer, US (b. 1973) |
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| peter klaassen NL (b. 1916) |
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| olaf-mihkel klaassen Estonian historian (1929-2012), EE (b. 1929) |
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| geertjen klaassen NL (b. 1920) |
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| walter klaassen (b. 1926) |
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| horst klaassen PL (b. 1928) |
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davy klaassen Dutch association football player, NL (b. 1993) |
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| f.m. klaassen NL (b. 1934) |
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| wil klaassen NL (b. 1939) |
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| leendert klaassen Dutch politician, NL (b. 1950) |
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| klaas berend klaassen (b. 1941) |
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