Surname Klassen (Klassen 
, Классен 
) , all around the world, is a common last name. The cognomen Klassen is habitual in Canada, where it is quite a common surname, Paraguay, and Belize, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Canada, Germany, and the United States.
| VARIANT | COUNTRY |
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| Klassen | Germany, Canada, United States, Paraguay, Mexico |
| Классен | Kyrgyzstan, Russia, Belarus, Kazakhstan, Ukraine |
| e. klassen (b. 1795) |
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| abraham klassen (b. 1802) |
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| johann peter klassen Canadian poet, CA (b. 1868) |
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ben klassen American engineer, author and politician (1918-1993), US (b. 1918) |
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| peter j. klassen (b. 1875) |
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| josef klassen DE (b. 1885) |
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| peter klassen German diplomat and author, DE (b. 1903) |
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| hans klassen DE (b. 1893) |
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| cornelius f. klassen DE (b. 1894) |
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terry klassen Canadian voice actor and director, CA (b. 1957) |
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| e. t. klassen American Postmaster general (1908-1990), US (b. 1908) |
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| johannes klassen DE (b. 1904) |
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| petr i. klassen (b. 1906) |
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pamela klassen scholar of religion (b. 1967) |
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heinrich klassen (b. 1961) |
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