| Settlement Type: | City |
| Official Name: | Valentín Alsina |
| Pushpin Map: | Argentina Greater Buenos Aires |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Greater Buenos Aires |
| Pushpin Mapsize: | 240 |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Buenos Aires |
| Subdivision Type2: | Partido |
| Subdivision Name2: | Lanús |
| Established Title: | Founded |
| Established Date: | 1874 |
| Population Total: | 41,155 |
| Coordinates: | -34.6667°N -83°W |
| Elevation M: | 7 |
| Postal Code Type: | CPA Base |
| Postal Code: | B 1822 |
| Area Code: | +54 11 |
Valentín Alsina is a city in the Lanús Partido of Buenos Aires Province, Argentina. It is located next to Buenos Aires city in the Gran Buenos Aires urban area.
The city was named after Valentín Alsina (1802–1869), two-time Governor of the independent State of Buenos Aires. It is considered one of the historical 'cien barrios porteños,' one of the 100 'barrios' of the city.
