Lanín National Park (Spanish: Parque Nacional Lanín) is a national park of Argentina, located in the Neuquén Province, with forests of diverse tree varieties, mainly Fagaceae and conifers such as the lenga and the Araucaria, many species of which are not found elsewhere in Argentina.
Within the park is located the famous Lanín volcano, with its cone shape and snowy top. It also holds the Huechulafquen, Aluminé, and Lácar lakes among others. In them, and the numerous rivers and streams, sport fishing of salmon and trout is practiced. The animal life of the park is similar to the southern Nahuel Huapi National Park.
The tourist city of San Martín de los Andes on the shore of Lake Lácar serves as hub for tourists visiting the park, as well as to skiers visiting the nearby Chapelco ski centre.