El Vellón is a municipality of the Community of Madrid, Spain. It is known for the Watchtower of El Vellón.
The municipality is considered a PSOE stronghold. The party has a majority in the eleven-seat government. The mayor is Catalina Llorente Fernández.
El Vellón has three line buses, all of them operated by ALSA. Two of them connect the village with Madrid. These lines are:
Line 191: Madrid (Plaza de Castilla) - Buitrago
Line 193: Madrid (Plaza de Castilla) - Pedrezuela - El Vellón
Line 197D: Torrelaguna - El Vellón - El Molar