| Official Name: | San Martín de Valdeiglesias |
| Pushpin Map: | Spain |
| Pushpin Map Caption: | Location in Spain. |
| Subdivision Type: | Country |
| Subdivision Name: | Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Name1: | Madrid |
| Subdivision Type2: | Province |
| Area Total Km2: | 115.5 |
| Elevation M: | 681 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Website: | http://www.sanmartindevaldeiglesias.es |
San Martín de Valdeiglesias is a town of Comunidad de Madrid with a population is 8,812 people (2022[1]).
The Castle of Coracera was built in the fifteenth century.
San Martín is near to Cadalso de los Vidrios, Pelayos de la Presa, Villa del Prado, Aldea del Fresno, Navas del Rey y Colmenar del Arroyo, other towns of Comunidad de Madrid, and it is also near the village of Ávila: El Tiemblo, and Pantano de San Juan.
In the summer, San Martín, the population increases due to an influx of non-residents escaping the winter to spend their holidays.
The most well-known entertainers in the town are a music and dance group called "Grupo de Jotas María de la Nueva".
Festivals in San Martín are held between 7–12 September in honour of the Virgin Mary.