Guadalajara is a city and municipality in Spain, located in the autonomous community of Castilla-La Mancha. It is the capital of the Province of Guadalajara.

Lying on the central part of the Iberian Peninsula at roughly 685 meters (2,247 ft) metres above sea level, the city straddles the Henares River. As of 2018 it has a population of 86,222 which makes it the region's second most populated municipality.

The bridge across the Henares river is Arab but built on Roman foundations. It has several historic buildings such as the Palacio del Infantado, as well as many churches, such as the church of San Ginés. Although Guadalajara is the biggest city in its diocese, the cathedral is located in the nearby town of Siguenza. However, in Guadalajara, there is a "co-cathedral", the church of Saint Mary, in Mudejar style. Very close to this church, is placed the chapel known as "Capilla de Luis de Lucena", which has several fresco paintings on its walls and ceiling. The Church of los Remedios was declared Bien de Interés Cultural in 1924, and currently serves as the auditorium of the University of Alcalá. The Church of la Piedad was declared Bien de Interés Cultural in 1931.

Before the Civil War, Guadalajara was also known to be among the cities with most number of antique azulejos in the Iberian Peninsula housed in their buildings, since the city housed the largest collection of azulejos from Talavera de la Reina pottery; now almost all of those azulejos are lost.

The small villages (pedanías) of Iriépal, Taracena, Usanos, and Valdenoches that belong to the municipality feature few monumental landmarks other than their humble rural churches. Thus, in Iriépal there is the Concepción church, constructed in the 16th century, which is known for its Mudéjar tower. In Taracena there is the 17th century Church of the Immaculate, in a very simple Renaissance style. In Usanos, there is the 13th-century Romanesque church of the Assumption, considerably remodeled in later periods and which features a crenelated tower.

Other types of monuments that are also noteworthy are the Iriépal laundry, work of 1910 in historicist style with funding from the Jose Santa María de Hita Foundation, and Iriépal (1858) and Valdenoches (1656) funds.

Throughout all the villages there are examples of Castilian mansions, quite modest compared to those in the cities. Of note also is Villaflores, a farming village built in 1887, designed by Ricardo Velázquez Bosco and commissioned to Maria Diega Desmaissières.