| 25 de Mayo | |
| Native Name: | Partido de Veinticinco de Mayo |
| Settlement Type: | Partido |
| Coordinates: | -35.4167°N -70°W |
| Subdivision Type: | Country |
| Subdivision Name: | Argentina |
| Subdivision Type1: | Province |
| Subdivision Name1: | Buenos Aires |
| Established Title: | Established |
| Established Date: | November 8, 1836 |
| Founder: | Coronel Juan Isidro Quesada |
| Seat Type: | Seat |
| Seat: | Veinticinco de Mayo |
| Leader Party: | FPV |
| Leader Title: | Mayor |
| Leader Name: | Hernán Ralinqueo |
| Unit Pref: | Metric |
| Area Total Km2: | 4769 |
| Population Total: | 34877 |
| Population Density Km2: | auto |
| Population Demonym: | venticinqueño |
| Postal Code Type: | Postal Code |
| Postal Code: | B6660 |
| Postal2 Code Type: | IFAM |
| Postal2 Code: | BUE130 |
| Area Code Type: | Area Code |
| Area Code: | 02345 |
| Blank Name Sec1: | Patron saint |
| Blank Info Sec1: | Na. Sra. del Rosario |
Veinticinco de Mayo Partido (25 May) is a partido in the centre-north of Buenos Aires Province in Argentina.
The provincial subdivision has a population of about 35,000 inhabitants in an area of 4769sqkm, and its capital city is Veinticinco de Mayo, which is around 228km (142miles) from Buenos Aires.