Family name Piacentini (Де 
, Piacentini 
, פיאצ'נטיני 
) , around the globe, is a common surname. The last name Piacentini is habitual in Italy, where it is quite a common surname, Kyrgyzstan, where it is quite a rare surname, and Argentina. In absolute terms, it is the most numerous in Italy, Brazil, and Russia. Much less frequently, Piacentini is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Де | Uzbekistan, Russia, Kyrgyzstan, Azerbaijan, Ukraine |
| Piacentini | Brazil, Italy, France, United States, Argentina |
| פיאצ'נטיני | Israel |
| arcangelo piacentini Italian presbyter, IT (b. 1390) |
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| jacopo piacentini Italian physician (1672-1762), IT (b. 1672) |
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| dionisio gregorio piacentini Italian monk and philologist, IT (b. 1684) |
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| marco antonio piacentini Roman Catholic bishop (b. 1713) |
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pio piacentini Italian architect (1846-1928), IT (b. 1846) |
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| giuseppe piacentini rinaldi Italian politician, IT (b. 1803) |
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settimio piacentini Italian general (1859-1921), IT (b. 1859) |
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marcello piacentini Italian architect (1881-1960), IT (b. 1881) |
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| leopoldo piacentini Italian politician, IT (b. 1841) |
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| alessandro piacentini IT (b. 1837) |
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pietro piacentini Italian general, IT (b. 1898) |
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| arthur piacentini FR (b. 1850) |
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carlos primo lópez piacentini AR (b. 1919) |
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| mario piacentini (b. 1887) |
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| massimo piacentini Italian engineer and urban planner, IT (b. 1898) |
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