Valdemarín is a ward (barrio) of Madrid belonging to the district of Moncloa-Aravaca. Its code number is 95 and, as of 2006, its population was of 4,000.

The ward is located in north-western area of the city, crossed by the M-40 orbital motorway and close to the borders of Moncloa-Aravaca with Fuencarral-El Pardo. Nearest barrios are Aravaca, in the south, and Ciudad Universitaria, in the east. Just in the north of Valdemarín, over the M-40, is situated a great city forest (16,000 ha) named Monte de El Pardo.

The principal road of the ward is Avenida de Valdemarín, running from east to west.

40°28′21.22″N 3°46′48.86″W / 40.4725611°N 3.7802389°W / 40.4725611; -3.7802389