| Official Name: | Castelli |
| Pushpin Map: | Argentina |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Argentina |
| Pushpin Mapsize: | 200 |
| Pushpin Mapsize1: | 200 |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Buenos Aires |
| Subdivision Type2: | Partido |
| Subdivision Name2: | Castelli |
| Population Total: | 6702 |
| Coordinates: | -36.1°N -104°W |
| Elevation M: | 3 |
| Postal Code Type: | CPA Base |
| Postal Code: | B 7114 |
| Area Code: | +54 2245 |
Castelli is a town in Buenos Aires Province, Argentina. It is the administrative centre for Castelli Partido.