| San Juan River | |
| Pushpin Map: | Tierra del Fuego |
| Pushpin Map Caption: | Location of the mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | Chile |
| Discharge1 Avg: | 20m3/s[1] |
| Mouth Location: | Strait of Magellan |
San Juan River (Spanish; Castilian: río San Juan) is a river in Brunswick Peninsula in Chile's Magallanes Region. The river is the main water supply for the city of Punta Arenas.[1] It drains to the Strait of Magellan.[1]