Montejo de la Sierra is a municipality in the Community of Madrid, Spain. It is one of the smaller settlements within the region, located in the northern part of the Community of Madrid.
The municipality is known for its natural surroundings, which form part of the Sierra del Rincón area in the Madrid region's mountainous north. The village sits at an elevation typical of the Sierra de Ayllón foothills, and its traditional architecture reflects the character of the rural settlements found throughout this part of central Spain.
Like other municipalities in the Community of Madrid, Montejo de la Sierra is governed as a local administrative unit within the autonomous community, which is itself one of Spain's seventeen autonomous communities. The area remains predominantly rural, with a small resident population and a landscape shaped by its position in the region's northern highlands.