The Mariano Procópio Museum is a museum of art, history and the natural sciences located in Juiz de Fora, Minas Gerais, Brazil. Founded in 1915 by Alfredo Ferreira Lage, it was the first museum ever built in Minas Gerais, and the third museum ever built in Brazil. The museum contains approximately 45,000 specimens.
The museum consists of two buildings: The Villa Ferreira Lage, constructed between 1856 and 1861, and an annex built in 1922 specifically for the museum. Much of the collection and a large section of the gardens are currently closed for restoration.Along with its art and armoury collections, the museum serves as an important collection of items of ecological interest, complete with large gardens and diverse examples of Brazilian flora.