| San Juan Nonualco | |
| Settlement Type: | Municipality |
| Pushpin Map: | El Salvador |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Pushpin Map Caption: | Location in El Salvador |
| Subdivision Type: | Country |
| Subdivision Name: |  El Salvador |
| Subdivision Type1: | Department |
| Subdivision Name1: | La Paz |
| Leader Title: | Mayor |
| Leader Name: | José Guillermo Rodas Ramos[1] |
| Unit Pref: | Imperial |
| Area Total Km2: | 65.49 |
| Population As Of: | 2016 |
| Population Total: | 19 336 |
| Population Blank1 Title: | Ethnicities |
| Coordinates: | 13.5072°N -88.8997°W |
| Elevation M: | 190 |
San Juan Nonualco is a municipality in the La Paz department of El Salvador. According to the official census of 2007, it has a population of 17,256 inhabitants,[2] although for the year 2016 it is estimated that 19,336 inhabitants live in the city.