Alfredo Ernesto de Sá Cardoso (June 6, 1864 – April 24, 1950), commonly known as Alfredo de Sá Cardoso (Portuguese pronunciation: [a?'f?edu e?'n??tu d? 'sa k??'dozu]), or just Sá Cardoso, was a Portuguese republican politician of the Portuguese First Republic who served twice as Prime Minister of Portugal.