| Piastów | |
| Pushpin Map: | Poland |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Subdivision Type2: | County |
| Subdivision Name2: | Pruszków |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Piastów (urban gmina) |
| Leader Title: | Mayor |
| Leader Name: | Grzegorz Waldemar Szuplewski |
| Established Title: | Established |
| Established Date: | 16th century as Żdżary |
| Established Title3: | Town rights |
| Established Date3: | 1952 |
| Area Total Km2: | 5.83 |
| Area Urban Km2: | 5.76 |
| Population As Of: | 2014 |
| Population Total: | 22826 |
| Population Density Km2: | auto |
| Population Urban: | 22826 |
| Population Density Urban Km2: | 4050.5 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 52.1833°N 71°W |
| Postal Code Type: | Postal code |
| Postal Code: | 05-820 |
| Area Code: | +48 22 |
| Blank Name: | Car plates |
| Blank Info: | WPR |
| Website: | http://piastow.pl/ |
Piastów is a town in central Poland, near Warsaw, with 23,331 inhabitants (2006 est). It is situated in the Masovian Voivodship (since 1999); previously, it was in Warszawa Voivodship (1975–1998). With 3963 persons/km², it is the second most densely populated township in Poland (after Świętochłowice).
In the Middle Age, the villages of Żdżary and Utrata existed in the place of today's' Piastów. Piastów is served by Piastów railway station.