The Mission Museum (Portuguese: Museu das Missões) is a historical museum in São Miguel das Missões, Rio Grande do Sul, Brazil. It is located on the site of the ruins of São Miguel das Missões, a jesuit reduction including the Church of São Miguel Arcanjo and surrounding ruins. The museum houses works from the church and statuary of the Rio Grande do Sul region. The museum was designed by the architect Lúcio Costa (1902–1998) and was built from materials from the ruins. It was conceived as an open shelter for religious works related to the church site; transparent glass panels were soon added.