| Pehuajó | |
| Native Name: | Partido de Pehuajó |
| Settlement Type: | Department |
| Coordinates: | -35.8°N -113°W |
| Subdivision Type: | Country |
| Subdivision Name: | Argentina |
| Established Title: | Established |
| Established Date: | 1889 |
| Founder: | Dardo Rocha |
| Seat Type: | Seat |
| Seat: | Pehuajó |
| Leader Party: | PJ |
| Leader Title: | Mayor |
| Leader Name: | Juan Mascheroni |
| Unit Pref: | Metric |
| Area Total Km2: | 4531 |
| Population Total: | 38400 |
| Population Density Km2: | auto |
| Population Demonym: | pehuajense |
| Postal Code Type: | Postal Code |
| Postal Code: | B6450 |
| Postal2 Code Type: | IFAM |
| Postal2 Code: | BUE092 |
| Area Code Type: | Area Code |
| Area Code: | 02396 |
| Blank Name Sec1: | Patron saint |
| Blank Info Sec1: | San Anselmo |
Pehuajó Partido (pronounced as /es/) is a partido in the northeast of Buenos Aires Province in Argentina.
The provincial subdivision has a population of about 40,000 inhabitants in an area of 4531km2, and its capital city is Pehuajó, which is around 389km (242miles) from Buenos Aires.