Cognomen Klemens (Klemens 
, Климент 
, كليمنس 
) , throughout the world, is a common surname. The surname Klemens is habitual in Poland, where it is quite a common surname, Namibia, where it is quite a rare surname, and Armenia. Not in comparison with a country's population, it is the most numerous in Poland, Germany, and Indonesia. Also, Klemens is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Klemens | Germany, Indonesia, United States, Poland, Austria |
| Климент | Russia, Bulgaria, Kazakhstan, Ukraine, Armenia |
| كليمنس | Palestinian Territory, Iraq |
| Клеменс | Kazakhstan, Russia, Ukraine |
| anna klemens Danish women killed by a mob for witchcraft, DK (b. 1718) |
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jozef božetech klemens Czech photographer (1817-1883), SK (b. 1817) |
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| jan ludvík klemens CZ (b. 1822) |
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| johann lid. klemens (b. 1823) |
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| ludwig august klemens PL (b. 1830) |
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| viktor klemens holocaust victim, b. 1885-09-21, CZ (b. 1885) |
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| hermann klemens holocaust victim, b. 1887-11-29, CZ (b. 1887) |
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| julius klemens holocaust victim, b. 1894-03-08, CZ (b. 1894) |
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| kamila klemensová holocaust victim, b. 1894-05-25, CZ (b. 1894) |
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| zofia klemens Polish Righteous Among the Nations, PL (b. 1910) |
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| vladimír klemens CZ (b. 1905) |
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| robert klemens holocaust victim, b. 1924-07-14, CZ (b. 1924) |
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| františek klemens CZ (b. 1914) |
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ben klemens Australian economist, AU (b. 1975) |
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| edward klemens Polish teacher (1939-2006), PL (b. 1939) |
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