Cognomen Mroczynski (Mroczynski 
) , around the world, is a rare surname. The surname Mroczynski is characteristic of Poland, where it is a rare surname, Norway, where it is a very rare surname, and the United States. Measured by absolute frequency, it is the most numerous in Poland, the United States, and Germany. Also, Mroczynski is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mroczynski | United Kingdom, Germany, Poland, Canada, United States |
| roswitha mroczynski German handball player, DE (b. 1963) |
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| robert mroczynski researcher |
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| robert mroczynski (b. 1976) |
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