Rayo Vallecano de Madrid, often abbreviated to Rayo, is a Spanish football team based in Madrid, in the neighborhood of Vallecas.

Rayo Vallecano was founded on 29 May 1924, and currently compete in La Liga following promotion from 2020–21 Segunda División season. Home games are held at the 14,708-seater Campo de Fútbol de Vallecas stadium.

Rayo has competed in one European competition, the UEFA Cup in the 2000–01 season. The club made it to the quarter-finals before losing to fellow Spanish club Alavés 4–2 on aggregate.

By historical standard, Rayo is the third best club in Community of Madrid, after Real Madrid and Atlético Madrid.