João Pinheiro Chagas (1 September 1863 – 28 May 1925; Portuguese pronunciation: [ʒuˈɐ̃w̃ piˈɲɐjɾu ˈʃaɡɐʃ]) was a Portuguese journalist and politician. He was born in Rio de Janeiro, Brazil, of Portuguese parents who soon moved back to Portugal. He was an editor at the newspapers O Primeiro de Janeiro, Correio do Norte, O Tempo and O Dia. After becoming a republican, he also founded the República Portuguesa and was the director of O País (1898).