Ion Constantin Brătianu (Romanian pronunciation: [iˈon brətiˈanu]; June 2, 1821 – May 16, 1891) was one of the major political figures of 19th century Romania. He was the younger brother of Dimitrie, as well as the father of Ionel, Dinu, and Vintilă Brătianu. He also was the grandfather of poet Ion Pillat.