| Arroyito Dam | |
| Coordinates: | -39.107°N -68.5855°W |
| Country: | Argentina |
| Status: | O |
| Opening: | 1979 |
| Dam Crosses: | Limay River |
| Dam Height Thalweg: | 26m (85feet) |
| Res Surface: | 38.6km2 |
| Res Elevation: | 315m (1,033feet) |
| Plant Turbines: | 3 x 42,6 MW |
| Plant Capacity: | 127.8 MW |
The Arroyito Dam (in Spanish, Embalse de Arroyito) is the fifth of five dams on the Limay River in northwestern Argentine Patagonia (the Comahue region), at above mean sea level. It was inaugurated in 1979.
The dam is made of compacted loose materials. It has a volume of, measuring in height and in length. It is used primarily for the generation of hydroelectricity, with an installed power of . It generates on average per year. It also serves as a check dam for El Chocón, located upstream.
The reservoir has an area of and a volume of . Its depth is on average (maximum:).