| Malargüe | |
| Native Name: | Departamento Malargüe |
| Settlement Type: | Department |
| Coordinates: | -36.1667°N -89°W |
| Subdivision Type: | Country |
| Subdivision Name: | Argentina |
| Established Title: | Established |
| Established Date: | November 16, 1850 |
| Seat Type: | Seat |
| Seat: | Malargüe |
| Leader Title: | Mayor |
| Leader Name: | Celso Jaque, PJ |
| Unit Pref: | Metric |
| Area Total Km2: | 41,317 |
| Population Total: | 23,020 |
| Population Density Km2: | auto |
| Population Demonym: | malargüino/na |
| Postal Code Type: | Postal Code |
| Postal Code: | M5613 |
| Postal2 Code Type: | IFAM |
| Postal2 Code: | MZA010 |
| Area Code Type: | Area Code |
| Area Code: | 02627 |
| Blank Name Sec1: | Patron saint |
| Blank Info Sec1: | Nuestra Señora del Rosario |
Malargüe is a department located in the south west of Mendoza Province in Argentina. Its borders are San Rafael in the north, La Pampa Province in the east, Neuquén Province in the south and Chile to the west.
The provincial subdivision has a population of about 23,000 inhabitants in an area of, and its capital city is Malargüe, which is located around from the federal capital Buenos Aires.
The south of Malargüe Department is considered the northern tip of Patagonia and is home to many nature reserves such as La Payunia, Castillos de Pincheira, Caverna de las Brujas and Laguna de Llancanelo.
The department is divided into four districts:
Malargüe has many hydric resources. Among its most important rivers are the Grande River, the Colorado River, the Barrancas River and the Malargüe River, and the lagoons of Llancanelo, Negra and Niña Encantada.
Malargüe is home to the Pierre Auger Observatory, an observatory designed to detect ultra-high-energy cosmic rays.
The department has many exciting natural landmarks and is well suited for adventure tourism such as mountaineering, paragliding, rafting and kayaking. Here are located such exciting landmarks as Castillos de Pincheira, Tigre Cave, Brujas Cave and Pozo de las Ánimas - two closely located, up to 101 m deep sinkholes, where the wind often creates a howling sound.
Malargüe Department is home to the famous skiing resort of Las Leñas.