| Olavarría | |
| Native Name: | Partido de Olavarría |
| Settlement Type: | Department |
| Subdivision Type: | Country |
| Subdivision Name: | Argentina |
| Established Title: | Established |
| Established Date: | November 25, 1867 |
| Founder: | Coronel Álvaro Barros, ley provincial |
| Seat Type: | Seat |
| Seat: | Olavarría |
| Leader Party: | PRO-Cambiemos |
| Leader Title: | Mayor |
| Leader Name: | Ezequiel Galli |
| Unit Pref: | Metric |
| Area Total Km2: | 7715 |
| Population Total: | 111708 |
| Population Density Km2: | auto |
| Population Demonym: | olavarriense |
| Postal Code Type: | Postal Code |
| Postal Code: | B7400 |
| Postal2 Code Type: | IFAM |
| Postal2 Code: | BUE090 |
| Area Code Type: | Area Code |
| Area Code: | 02284 |
| Blank Name Sec1: | Patron saint |
| Blank Info Sec1: | San José |
Olavarría Partido is a partido in the central region of Buenos Aires Province in Argentina.
The provincial subdivision has a population of about 104,000 inhabitants in an area of 7715sqkm, and its capital city is Olavarría, which is around 350km (220miles) from Buenos Aires.