| San Ildefonso, Hidalgo | |
| Settlement Type: | Town |
| Native Name: | |
| Pushpin Map: | Mexico Hidalgo#Mexico |
| Pushpin Label Position: | above |
| Pushpin Map Caption: | Location in Mexico |
| Subdivision Type: | Country |
| Subdivision Name: |  Mexico |
| Subdivision Type1: | State |
| Subdivision Name1: | Hidalgo |
| Population As Of: | 2010 |
| Population Total: | 4423 |
| Coordinates: | 19.95°N -153°W |
San Ildefonso (nah|Chantepec and Otomi Mangu)[1] is a town of Tepeji del Río municipality, in central-eastern Mexico. It is a town near to Tula de Allende city.
As of 2010, the town had a total population of 4,423.[2] 90% of the people speak otomi language.[3]