Dom João Carlos de Bragança e Ligne de Sousa Tavares Mascarenhas da Silva, 2nd Duke of Lafões, 4th Marquis of Arronches and 8th Count of Miranda do Corvo (Lisbon, 6 March 1719 – Lisbon, 10 November 1806) was a politician and prominent member of the high Portuguese nobility.
He was the marshal general of the Portuguese Army, which he commanded during that which was jokingly known as the War of the Oranges, a traumatic experience in the History of Portugal.
A founding member of the Academia Real das Ciências of Lisbon, he also exercised the office of minister assistant to the dispatch (Prime Minister) of Portugal, between 6 January and 21 May 1801, being dismissed from office after the entry of the Spanish forces in the Alentejo, he retained the dignity of marshal of the army.