Cuéllar 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 8,316 in 2019.

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. Flowing through 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.

Cuéllar has a long-standing agriculture tradition. Specific crops are cereals, vegetables, chicory, legumes, and beet. Specific livestock raised are pigs, sheep and cows. Many years ago, forestry and resin production were important economic resources too.

Festivals:

• Children's day: It is celebrated on New Year's Day. This is an old tradition, consisting in a procession centered in the Child of The Ball. The child is accompanied by musicians and dancers, and all are dressed in the 15th century clothes. They march through the town and many people use to join them.
• Running of the bulls: This festival is considered the oldest in Spain. It was dated since 1215, when a request was written to forbid priests to run with the bulls, but it is believed that the pagan tradition started before the Christianity. They are celebrated for 5 days, beginning on the last Saturday evening of August, and they honor Our Lady of the Rosary. Early in the morning, the bulls run from the corral near the river 5 km away to the bull-ring. They are guided by horsemen when they are in the pine-forest, and by the people when they arrive to town. Parties and celebrations join the running when people from everywhere enjoy the traditional dishes of roasted lamb and the regional wines.
• Annual Pilgrimage to the sanctuary of Our Lady of the Hayfield (Nuestra Señora del Henar): Every 17 September the devout people from the area go together to pray and to celebrate. This sanctuary is 5 km away from Cuéllar and it is a popular leisure place too.