| Lavalle | |
| Native Name: | Departamento Lavalle |
| Settlement Type: | Department |
| Coordinates: | -32.7167°N -103°W |
| Subdivision Type: | Country |
| Subdivision Name: | Argentina |
| Established Title: | Established |
| Established Date: | October 20, 1853 |
| Seat Type: | Seat |
| Seat: | Villa Tulumaya |
| Leader Title: | Mayor |
| Leader Name: | Edgardo González, PJ |
| Unit Pref: | Metric |
| Area Total Km2: | 10212 |
| Population Total: | 32,129 |
| Population Density Km2: | auto |
| Population Demonym: | Lavallino/na |
| Postal Code Type: | Postal Code |
| Postal Code: | M5664 |
| Postal2 Code Type: | IFAM |
| Postal2 Code: | MZA007 |
| Area Code Type: | Area Code |
| Area Code: | 02614 |
Lavalle Department is a department located in the northeast of Mendoza Province in Argentina.
The provincial subdivision has a population of about 32,000 inhabitants in an area of, and its capital city is Villa Tulumaya, which is located around from the Capital federal.