Family name Mikolajczyk (Mikolajczyk 
, Миколайчик 
) , throughout the world, is a common cognomen. The cognomen Mikolajczyk is habitual in Poland, where it is quite a common surname, Belarus, where it is quite a rare surname, and Ireland. Measured by absolute frequency, this name is the most popular in Poland, the United States, and Germany. More frequently, Mikolajczyk is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mikolajczyk | Germany, United Kingdom, France, Poland, United States |
| Миколайчик | Belarus, Russia, Ukraine, Kazakhstan |
| ron mikolajczyk American football player, US (b. 1950) |
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| daniel mikolajczyk French athletics competitor, FR (b. 1951) |
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| adam mikolajczyk researcher |
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| szczepan mikolajczyk researcher |
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| janusz mikolajczyk researcher |
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| edyta mikolajczyk researcher |
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| t. mikolajczyk researcher |
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| erwin mikolajczyk perpetrator of the Euskirchen court shooting, DE |
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| tomasz mikolajczyk researcher |
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| krystian mikolajczyk Ph.D. Institut National Polytechnique de Grenoble 2002 |
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| rafael mikolajczyk researcher |
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| krystian mikolajczyk computer vision researcher |
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