Collado Villalba

Club Unión Collado Villalba was a Spanish football club based in Collado Villalba, in the autonomous community of Madrid. Founded in 1960, it was dissolved in 2025, and held home games at Ciudad Deportiva de Collado Villalba, which has a capacity of 1,000 spectators.

Club Deportivo Villalba was founded in 1960. In 1975, they merge with another club of the city to form Unión Deportiva Collado Villalba, renamed in 1992 as Club Unión Collado Villalba. On 30 May 2023, the club became the reserve team of CF Rayo Majadahonda, replacing CD Paracuellos Antamira.

On 1 July 2024, Collado Villalba became the second reserve team of Atlético Madrid after a ten-year agreement was reached; for the 2025–26 season onwards, the club will be fully incorporated into Atleti's structure and will be replaced by Atlético Madrid C. On 19 June 2025, the club was officially absorbed by Atleti; their Tercera Federación spot went on to Atlético C, while their youth sides remained under the name of Club Atlético Villalba.