Last name Trojanowski (Trojanowski 
, Трояновский 
) , all around the world, is quite a common family name. The surname Trojanowski is characteristic of Poland, where it is quite a rare surname, Belarus, and Israel, where it is a rare surname. Measured by absolute frequency, it is commonest in Poland, the United States, and Russia. Also, Trojanowski is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Trojanowski | Germany, France, United States, United Kingdom, Poland |
| Трояновский | Kazakhstan, Ukraine, Kyrgyzstan, Belarus, Russia |
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wincenty trojanowski Polish painter and medallist (1859-1928), PL (b. 1859) |
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stanisław tymoteusz trojanowski PL (b. 1908) |
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| edward trojanowski Polish painter (1873-1930), PL (b. 1873) |
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| adam trojanowski (b. 1864) |
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| jerzy trojanowski Polish officer, PL (b. 1893) |
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| jan trojanowski PL (b. 1884) |
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| sylwester trojanowski PL (b. 1891) |
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| bolesław trojanowski Polish architect, PL (b. 1902) |
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| wojciech trojanowski Polish sportsperson and athletics competitor (1904-1988), PL (b. 1904) |
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| leon trojanowski RU (b. 1896) |
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| marian trojanowski Polish economist, PL (b. 1907) |
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| stanisław trojanowski PL (b. 1901) |
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| edward trojanowski Polish sportsperson and athletics competitor, PL (b. 1912) |
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| andrzej trojanowski PL (b. 1905) |
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| wiktor trojanowski (b. 1906) |
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