Dom Diogo de Souza Museum, Historical museum in Bagé, Brazil.

The Dom Diogo de Souza Museum occupies the building of the Portuguese Beneficence Society of Bagé at Rua Emílio Guilain 759, where it has been housed since 22 March 1975. Its collection of more than two thousand items covers clothing, personal objects, household articles and furniture, alongside uniforms and weapons of 18th-century Spanish and Portuguese troops.

The museum grew out of a historical and cultural exhibition held on 2 May 1955 at the Centro Social Católico to mark the bicentenary of the birth of Dom Diogo de Souza, founder of Bagé. Historian Tarcísio Taborda gathered donated objects, and the museum opened on 20 September 1956 in a room of the Vila Vicentina asylum. It moved on 22 March 1975 to the building of the Sociedade Portuguesa de Beneficência, later maintained under an agreement with the Fundação Áttila Taborda.

The collection displays objects that tell the story of daily life in the region, including weapons from earlier centuries and uniforms worn by military units. These pieces help visitors understand how the area developed over generations.

The museum occupies the Sociedade Portuguesa de Beneficência building at Rua Emílio Guilain, 759, in Bagé. It has been housed there since 22 March 1975, after moving from the Vila Vicentina asylum where it opened in 1956. Visitors heading there should look for this address rather than the 1955 exhibition site on Avenida General Osório.

The museum maintains extensive archives with historical photographs and vintage newspaper collections from the region. These materials allow visitors to explore the visual history of Bagé and the surrounding area.