The Palace of the Public Ministry of the State of Rio Grande do Sul, or simply Palace of the Public Ministry, also known as Fort Apache, is a historic building in Porto Alegre, the capital of Rio Grande do Sul. It is located in the Mother Church Square and integrates a complex of buildings of great architectural and historical significance. Due to its multiple uses and design over time, this building received many names, such as Provincial Assembly Building, Provisional Palace, Public Offices Building, and Public Works Building.

The Piratini Palace is the current seat of the Executive Branch of the Brazilian state of Rio Grande do Sul. It is located at Marechal Deodoro Square, also known as the Mother Church Square, in Porto Alegre's historic center. The Piratini Palace has been the official residence of thirty-eight governors.