Last name Ostaszewski (Ostaszewski 
) , throughout the world, is quite a rare family name. The cognomen Ostaszewski is characteristic of Poland, where it is quite a rare surname, Czechia, where it is a rare surname, and Denmark. Not in comparison with a country's population, this name is the most popular in Poland, the United States, and Colombia. Likewise, Ostaszewski is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ostaszewski | Germany, Colombia, Canada, Poland, United States |
| franciszek ostaszewski (b. 1610) |
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tomasz ostaszewski PL (b. 1746) |
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adam ostaszewski PL (b. 1750) |
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| florian ostaszewski (b. 1710) |
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| michał ostaszewski PL (b. 1735) |
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kazimierz ostaszewski PL (b. 1786) |
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ignacy ostaszewski PL (b. 1792) |
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| jan ostaszewski PL (b. 1745) |
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| nereusz ostaszewski PL (b. 1755) |
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| sebastian ostaszewski PL (b. 1755) |
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antoni ostaszewski Polish physician, UA (b. 1816) |
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teofil wojciech ostaszewski PL (b. 1807) |
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| beda ostaszewski PL (b. 1764) |
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| józef ostaszewski PL (b. 1765) |
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władysław ostaszewski Polish railway engineer, PL (b. 1827) |
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