Surname Koss (Koss 
, Kys 
, คอส 
) , around the globe, is a common family name. The cognomen Koss is habitual in Estonia, where it is quite a rare surname, Germany, and Moldova. In absolute terms, it is commonest in the United States, Germany, and Poland. Much less frequently, Koss is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Koss | Germany, Canada, Poland, United States, Cameroon |
| Kys | Germany, Canada, Poland, United States, Democratic Republic of the Congo |
| คอส | Thailand |
| Косс | Kazakhstan, Russia, Ukraine, Belarus |
| christian von koss (b. 1698) |
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franciszek koss PL (b. 1792) |
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eugenia koss Polish actress, FR (b. 1806) |
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ignacy koss PL (b. 1800) |
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| peter tønder von koss NO (b. 1755) |
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| joseph von koss Danish diplomat (1787-1858) (b. 1787) |
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| peter henrich koss Norwegian politician, NO (b. 1795) |
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adam koss Polish chemist, PL (b. 1877) |
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polly koss Austrian actor and singer, AT (b. 1880) |
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rudolf koss CZ (b. 1884) |
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| richard koss DE (b. 1850) |
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| henning von koss (b. 1855) |
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| malvine koss holocaust victim, b. 1868-08-18, AT (b. 1868) |
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| karl koss (b. 1861) |
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| karl koss AT (b. 1865) |
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