Aguilar de Campoo is a town in the province of Palencia, autonomous community of Castile and León, Spain. It is close to the River Pisuerga. Its 2011 population is 7741.

It is one of the locations of the St. James' Northern Way (Ruta del Besaya). Since 2017, the municipality has been included in the Geopark of Las Loras, the first UNESCO Geopark in Castile and León.

Main sights include:

• Monastery of Santa María la Real (11th-13th centuries)
• Collegiate Church of San Miguel (11th-16th centuries)
• Church of Olleros de Pisuerga (7th-9th centuries)
• Hermitage of Santa Cecilia (12th century)
• Church of San Andrés (12th century)
• Monastery of Santa Clara (founded in 1430)
• Medieval castle
• Major Square
• Palace of the Manrique (Marquess of Aguilar de Campoo)
• Palace of the Villalobos-Solorzano
• Palace of the Marquises of Villatorre
• House of the Priest
• House of Santa Maria La Real
• House of the Marcos Gutierrez
• House of the Seven Linajes (lineages)
• House of the Velardes
• Medieval walls and gates
• Major Bridge
• Bridge of Portazgo
• Bridge of Turruntero Mill
• Bridge of la Teja
• Bridges of Paseo de la Cascajera
• Bridges of Tenerias