Cogollor is a municipality in the province of Guadalajara, within the autonomous community of Castile-La Mancha, Spain. It is a small rural settlement in the central part of the country.
The municipality covers a total area of 8.32 square kilometres and lies at an elevation of 950 metres above sea level. As of 1 January 2019, it had a population of 25 inhabitants, making it one of the least populated municipalities in the province.