Santa Branca Reservoir
                    General data
- Name: Santa Branca Reservoir
 - Water system: Paraiba do Sul River
 - Water type: Artificial lake
 - Progression: Paraiba do Sul River -> Atlantic Ocean -> Planet Earth
 - Climates: Tropical
 - Continents: South America
 - Countries: Brazil
 
The Santa Branca Reservoir is a hydroelectric dam and reservoir located in Brazil, within the Paraíba do Sul River basin. Owned by Light Energia, it was built in the 1990s, generating electricity for commercial use and contributing to the water supply of the Metropolitan area of Rio de Janeiro. The reservoir has faced ecological challenges, including the invasion of invasive species and concerns about water quality due to potential genotoxicity from past spills, but it remains a crucial infrastructure for the region.