Cuéllar (Spanish pronunciation: [ˈkweʎar]) is a small Town and Municipality in the Province of Segovia, in the autonomous community of Castile and León, in Spain. It had a population of 9,725 in 2011.

The town is settled on a hill, and it is 60 km north-east of the capital city of Segovia, and 50 km south of Valladolid. It has an extension of 272 km² and it is 857 m above sea level. Flowing though the town are the rivers Cerquilla and Cega. To the north, the town borders the municipality of Bahabón (province of Valladolid); to the south it borders Sanchonuño; to the east is Frumales; and to the west are the municipalities of San Cristóbal de Cuéllar and Vallelado.