Club Deportivo Leganés, S.A.D. is a Spanish football team from Leganés, in the Madrid outskirts. Founded on 26 June 1928 it currently plays in Segunda División, holding home games at Estadio Municipal de Butarque, which seats 8,138 spectators.

Team colours are white shirts with blue stripes, and white shorts.

Leganés played the vast majority of its existence in the lower leagues. In 1977 the club regained promotion to the fourth division, where it had played before for seven years when the category was still the third level.

After a steady progression, Leganés reached the new division three in 1987, being promoted to the second division six years later and maintaining its league status for 11 seasons; during this timeframe, it collected two consecutive eighth places (best) from 1995–97.

The fans have friendly relation with ultras group Gate 12 of Egaleo F.C., the towns of Egaleo and Leganés happen to be twinned too. Their biggest rival is Getafe CF with whom they contest the South Madrid Derby.