Eldorado do Sul is a municipality in the state of Rio Grande do Sul, Brazil. It is located in the metropolitan area of Porto Alegre, the state's capital and largest city, opposite the capital on the right bank of Guaíba River. Population: 33,098 (est. 2008).
The Eldorado do Sul RBS Radio Mast, located in its territory, is the tallest man-made structure in Brazil.