Rayo Vallecano B is the reserve team of the renowned La Liga club Rayo Vallecano. Based in the Madrid neighborhood of Vallecas, the B team competes in the Spanish Segunda División RFEF, which is the fourth tier of Spanish football. Their primary purpose is to develop young players for the first-team squad, and they play their matches at the Ciudad Deportiva Rayo Vallecano. Under the guidance of the club's academy philosophy, the team emphasizes technical development and tactical understanding that aligns with the aggressive, passionate style of the senior side. Players who excel here often earn promotions to train with the first team and make their professional debuts. While they cannot be promoted to the same division as the first team, their success is measured in player progression, and they are a vital component of Rayo Vallecano's future.