Last name Kosmowski (Kosmowski 
) , across the world, is quite a rare cognomen. The cognomen Kosmowski is characteristic of Poland, where it is quite a rare surname, Germany, where it is a rare surname, and France. Not in comparison with a country's population, it is commonest in Poland, the United States, and Germany. Likewise, Kosmowski is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kosmowski | Germany, France, Poland, United Kingdom, United States |
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michał kosmowski Polish bishop (1725-1804), PL (b. 1725) |
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| stanisław kosmowski PL (b. 1752) |
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władysław kosmowski born 1830; architect (b. 1830) |
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| mieczysław kosmowski Polish Nazi collaborator, PL (b. 1913) |
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| patrycjusz kosmowski SE (b. 1947) |
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| drew kosmowski professor of clinical medicine |
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| frédéric kosmowski researcher |
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| siegfried kosmowski |
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