| Oncativo | |
| Native Name Lang: | es |
| Settlement Type: | City |
| Pushpin Map: | Argentina |
| Pushpin Map Caption: | Location of Oncativo in Argentina |
| Coordinates: | -31.9167°N -103°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Argentina |
| Subdivision Type1: | Province |
| Subdivision Type2: | Department |
| Subdivision Name2: | Río Segundo |
| Unit Pref: | Metric |
| Elevation M: | 287 |
| Population Total: | 13180 |
| Population As Of: | 2010 census |
| Population Density Km2: | auto |
| Timezone1: | ART |
| Utc Offset1: | -3 |
| Postal Code Type: | CPA base |
| Postal Code: | X5986 |
| Area Code Type: | Dialing code |
| Area Code: | +54 3572 |
Oncativo is a city in the province of Córdoba, Argentina. It has 13,180 inhabitants as per the . It is located near the center of the province, 76 km south-southeast from the provincial capital Córdoba City and 64 north-northwest from Villa María, by National Route 9.
Although the town had no official foundation, it is considered that it began with the arrival of the railway line and especially with the opening for public use of the train station of the Ferrocarril Central Argentino, 1 September 1869.
The area of the present-day city was the stage of the Battle of Oncativo, between the forces of generals Juan Facundo Quiroga and José María Paz, in 1830.