Alto Alegre dos Parecis () is a municipality located in the Brazilian state of Rondônia. Its population was 13,255 (2020) and its area is 3,958 km<sup>2</sup>.
The municipality contains 20% of the Corumbiara State Park, created in 1990. It also contained the Serra dos Parecis State Park, created in 1990 and cancelled in 2010.