Leganés is a city in the Community of Madrid, Spain. Considered part of the Madrid metropolitan area, it is located about 11 km southwest of the centre of Madrid. As of 2018, it has a population of 188,425, making it the region's fifth most populated municipality. It covers an area of 43.09 km2 and it is located at 667 m over sea level.

The Community of Madrid is one of the seventeen autonomous communities of Spain. It is located in the centre of the Iberian Peninsula, and of the Central Plateau. Its capital and largest municipality is the City of Madrid, which is also the capital of the country. The Community of Madrid is bounded to the south and east by Castilla–La Mancha and to the north and west by Castile and León. It was formally created in 1983, in order to address the particular status of the City of Madrid as the national capital city and in urban hierarchy. Its limits are those of the province of Madrid, which was until then conventionally included in the historical region of New Castile.