Last name Kostorz (Kostorz 
) , all around the world, is a rare cognomen. The family name Kostorz is characteristic of Poland, where it is a rare surname, Germany, and Czechia. Also, Kostorz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kostorz | Poland, United Kingdom, United States, Germany, Czechia |
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gernot kostorz German physicist and professor at ETH Zürich, DE (b. 1941) |
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| helmut kostorz German politician (1912-1986), DE (b. 1912) |
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| juta kostorz (b. 1943) |
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| jerzy kostorz Polish Catholic clergyman, PL (b. 1968) |
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| sina kostorz German volleyball player, DE (b. 1990) |
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| kacper kostorz Polish association football player, PL (b. 1999) |
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