The Brazilian ironclad Sete de Setembro was an wooden-hulled armored frigate built for the Brazilian Navy during the Paraguayan War in the late 1860s. Construction was delayed by a debate over her armament and she was not completed until 1874, by which time the ship was essentially obsolete. Sete de Setembro was transferred to Rio de Janeiro in the 1880s and captured by the rebels during the Fleet Revolt of 1893–94. She sank after she caught fire when the government forces recaptured her in late 1893.