| Tres Lomas | |
| Native Name: | Partido de Tres Lomas |
| Settlement Type: | Department |
| Coordinates: | -36.4589°N -62.8614°W |
| Subdivision Type: | Country |
| Subdivision Name: | Argentina |
| Established Title: | Established |
| Established Date: | July 20, 1907 |
| Founder: | ? |
| Seat Type: | Seat |
| Seat: | Tres Lomas |
| Leader Party: | FJV |
| Leader Title: | Mayor |
| Leader Name: | Roberto Oscar Alvarez |
| Unit Pref: | Metric |
| Area Total Km2: | 1253 |
| Population Total: | 7439 |
| Population Density Km2: | auto |
| Population Demonym: | ? |
| Postal Code Type: | Postal Code |
| Postal Code: | B6409 |
| Postal2 Code Type: | IFAM |
| Postal2 Code: | BUE129 |
| Area Code Type: | Area Code |
| Area Code: | 02394 |
| Blank Name Sec1: | Patron saint |
Tres Lomas Partido is a western partido of Buenos Aires Province in Argentina.
The provincial subdivision has a population of about 7,500 inhabitants in an area of 1253sqkm, and its capital city is Tres Lomas, which is around 520km (320miles) from Buenos Aires.
The economy of Tres Lomas is dominated by agriculture, the main crops are Sunflower, wheat and maize. There are around 150,000 head of cattle in the district and there are a number of dairy farms producing around 70,000 litres of milk per day.