The Sierra del Ocejón or Sierra del Robledal is a mountain range located in the central part of the Iberian Peninsula.

The range belongs to the Sistema Central. Its northern limit is considered the Río Sonsaz while Tamajón's territory is its southern border; from West to East the mountain range stretches from the valley of the Arroyo de la Matilla to the Río Sorbe.

Its highest point is the Ocejón, at 2068 metres. The northern part of the zone is scarcely inhabited and most of the population lives in the South of the range.

• Pico Ocejón (2.048 msnm),
• Campo (1.919 msnm),
• Campachuelo (1.889 msnm),
• Cerrito Collado (1.738 msnm),
• Peña del Reloj (1.506 msnm),
• Cabeza de Ranas (1.492 msnm).

• Campillo de Ranas,
• Majaelrayo,
• Tamajón,
• Valverde de los Arroyos.

The villages of the sierra are well known for their typical sheep breeds. Sierra del Ocejón area is also considered one of the places in Spain where the Arquitectura negra, a traditional building technique based on a wide use of slate, is very well preserved.

• DÍAZ MARTÍNEZ, Miguel Ángel y LÓPEZ BALLESTEROS, José Alberto (2003). La sierra de Ayllón (in Spanish). Madrid: Ediciones El Senderista. ISBN 84-95368-22-6.{{cite book}}: CS1 maint: multiple names: authors list (link)
• PLIEGO VEGA, Domingo (1998). Los dosmiles de la sierra de Ayllón (in Spanish). Madrid: Desnivel ediciones. ISBN 84-89969-03-5.

• Sistema Central