| Iglesia Basin | |
| Other Name: | Cuenca de Iglesia |
| Named For: | Iglesia |
| Pushpin Map: | Argentina |
| Pushpin Relief: | 1 |
| Coordinates: | -30.3333°N -69.3333°W |
| Region: | San Juan Province |
| State: | Iglesia Department |
| Cities: | Rodeo |
| Onoffshore: | Onshore |
| Boundaries: | Frontal Cordillera, Precordillera |
| Rivers: | Jáchal |
| Plate: | South American |
| Orogeny: | Andean |
| Age: | Neogene-Pleistocene |
Iglesia Basin (es|Cuenca de Iglesia) is a sedimentary basin located in northern San Juan Province, western Argentina. It is thought to be a piggyback basin.[1] Its sedimentary fill is of Neogene to Pleistocene age and has an estimated maximum thickness of 3.5 km.[1] There are hot springs in the eastern part of the basin.[1] The rock under the sedimentary fill is interpreted to be in part composed of plutonic intrusions belonging to the Tocota pluton, which in turn is a part of a larger group of plutonic intrusions known as the Colangüil Batholith.[2]