| Tongoy Bay | |
| Other Name: | Bahía de Tongoy |
| Location: | Coquimbo Region |
| Pushpin Map: | Chile |
| Pushpin Relief: | 1 |
| Pushpin Map Alt: | Location of Tongoy Bay off the coast of Chile. |
| Coords: | -30.2675°N -71.559°W |
| Type: | Oceanic bay |
| Outflow: | Pacific Ocean |
| Basin Countries: | Chile |
| Cities: | Tongoy, Puerto Aldea |
Tongoy Bay (es|Bahía de Tongoy) is a bay in Chile's Coquimbo Region. The bay is U-shaped, open to the north. Its western boundary is made up by the hilly and north-protruding Point Lengua de Vaca. More in detail the west boundary of the bay is made up of a seismic fault known as Puerto Aldea Fault.[1] On the shores of the bay lie the towns of Tongoy and Puerto Aldea and their respective beaches. Tongoy Bay is site of recurrent upwelling of cold, acidic and oxygen-poor seawater.[2] Oysters are cultivated in Tongoy Bay.[2]
Guanaqueros Bay lies a few kilometers north of Tongoy Bay being separated by the coastal mountain of Cerro Guanaquero.