The Serras de Sudeste Microregion (Portuguese: Microrregião das Serras de Sudeste) is a microregion in the southern part of the state of Rio Grande do Sul, Brazil. It is named after a hill range (a plateau) named Serras de Sudeste, which means Southeastern Mountain Ranges. The area is 16,512.614 kmò.
The microregion consists of the following municipalities: