| Official Name: | Valsaín |
| Settlement Type: | Village |
| Pushpin Map Caption: | Location in Spain. |
| Pushpin Map: | Spain |
| Subdivision Type: | Country |
| Subdivision Name: | Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Name1: | Castile and León |
| Subdivision Type2: | Province |
| Subdivision Name2: | Segovia |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Real Sitio de San Ildefonso |
| Population As Of: | 2016 |
| Population Total: | 176 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 40.8783°N -4.0275°W |
| Elevation M: | 1200 |
Valsaín is a hamlet of Real Sitio de San Ildefonso, which is a town and municipality located within the Province of Segovia in Castile and León. It is located in the foothills of the Sierra de Guadarrama mountains, 14km (09miles) from Segovia, and 75km (47miles) north of Madrid. The village had a population of 176 inhabitants in 2016 (source: INE, the Spanish Statistical Office).
The ruins of the royal Palace of Valsain, a favorite summer palace of the Habsburg kings of Spain before they built the close by "La Granja" (Royal Palace of La Granja de San Ildefonso).