Cogolludo is a municipality in the province of Guadalajara, in the autonomous community of Castile-La Mancha, Spain. It lies within the comarca of La Serranía, a mountainous district in the northern part of the province.
The town was the manorial home of the Dukes of Medinaceli, one of Spain's most prominent noble houses. Its historic Church of Santa María stands in the town.
Cogolludo is a small municipality; in 2015 it had a population of 600 inhabitants.