Cognomen Mroczek (Mroczek 
) , globally, is quite a common surname. The family name Mroczek is habitual in Poland, where it is quite a common surname, Andorra, where it is quite a rare surname, and Serbia, where it is a rare surname. In absolute terms, it is commonest in Poland, the United States, and Germany. Also, Mroczek is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mroczek | United Kingdom, Poland, United States, Germany, Canada |
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andrzej mroczek PL (b. 1936) |
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| jan mroczek Polish Righteous Among the Nations, PL (b. 1902) |
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danuta mroczek-szlezer PL (b. 1952) |
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czesław mroczek Polish politician, PL (b. 1964) |
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| ludwik mroczek PL (b. 1905) |
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| jan mroczek Polish trade unionist, PL (b. 1917) |
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| czesław mroczek Polish actor (1920-2012), PL (b. 1920) |
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maciej mroczek Polish economist, PL (b. 1973) |
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rafał mroczek Polish actor, PL (b. 1982) |
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marcin mroczek Polish actor and dancer, PL (b. 1982) |
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| andrzej mroczek (b. 1941) |
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| józef mroczek (b. 1955) |
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| krzysztof mroczek (b. 1961) |
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| bożena mroczek researcher, PL |
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| ewa mroczek researcher |
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