| San Carlos River | |
| Mouth: | Paraguay River |
| Mouth Location: | near Puerto Pinasco, Paraguay |
| Mouth Coordinates: | -22.7935°N -57.8928°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Paraguay |
| Length: | 68km (42miles) |
The San Carlos River (Spanish; Castilian: Río San Carlos) is a river located in the Alto Paraguay Department of Paraguay.[1]