San Martín de los Andes is a city in the south-west of the province of Neuquén, Argentina. It serves as the administration centre of the Lácar Department.
The city lies at the foot of the Andes, on the Lácar lake, and is considered one of the main tourism destinations in the province. National Route 40 runs to the city, connecting it with important touristic points in the south of the province, such as Lanín and Nahuel Huapí national parks.