The naval Battle of Montevideo (Portuguese: Batalha Naval de Montevidéu) of 21 October 1823 formed a part of the Siege of Montevideo, as Brazilian forces sought to capture the last Portuguese redoubt in the Cisplatina during the War of Independence of Brazil.

The Portuguese forces, a captured schooner and three armed transports, had endured the Brazilian blockade of the port but only sought to break it on 21 October.

Despite heavy fighting neither side lost a ship, and the Portuguese withdrew to the port, with the conflict ending a month later with the surrender of Montevideo.

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