Real Madrid Castilla Club de Fútbol is a Spanish football team that plays in Primera Federación – Group 2.

In 1948, Agrupación Deportiva Plus Ultra, a local amateur team, then playing in the Tercera División, agreed to become a feeder club for Real Madrid.

During the 1950s and 1960s, future senior Real Madrid players and Spanish internationals such as José María Zárraga, Enrique Mateos, Ramón Marsal, Pedro Casado, Juan Manuel Villa, José María Vidal, Fernando Serena and Ramón Grosso all spent time at the club, and Juan Alonso finished off his career there.

In 1972, Plus Ultra folded because of the demise of the insurance company of the same name, and their position in the Tercera División was taken by Castilla Club de Fútbol, the new reserve team for Real Madrid, on 21 July.

During this era, with a team that included Agustín, Ricardo Gallego and Francisco Pineda, Castilla reached the final of the 1979–80 Copa del Rey.

During their cup run, they beat four Primera División teams, including Hércules, Athletic Bilbao, Real Sociedad and Sporting de Gijón.

Despite beating West Ham United 3–1 in the opening game at the Santiago Bernabéu, they lost the return 5–1 after extra time and went out in the first round.

Amaro's tenure as coach saw the rise of the famous La Quinta del Buitre – Emilio Butragueño, Manolo Sanchís, Martín Vázquez, Míchel, and Miguel Pardeza.

In the early 1990s, two former Castilla players, Vicente del Bosque and Rafael Benítez, began their coaching careers with the team.

Real Madrid Castilla was promoted back to the Segunda División at the end of the 2011–12 season after beating Cádiz in the play-offs with an aggregate of score 8–1 and this year the club produced one quality player, Dani Carvajal who was sold to Bayer Leverkusen in 2012 before he returned to Real Madrid in 2013 to play in the first team.

Since 2014 when they played in the third division, Castilla continued to produce other quality players, including Lucas Vázquez, Fernando Pacheco, Borja Mayoral, Marcos Llorente, Sergio Reguilón, Óscar Rodríguez, Achraf Hakimi and Fran García.

Real Madrid won the inaugural match 6–1 with goals from Sergio Ramos, Antonio Cassano (2), Roberto Soldado (2), and José Manuel Jurado.