Ion C. Bratianu (June 2, 1821 - May 16, 1891) was a Freemason and 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 Vintila Bratianu.
Born to wealthy Arges landowners in Pitesti, the state of Wallachia, he entered the Wallachian Army in 1838, and in 1841 started studying in Paris. Returning to his native land, Bratianu took part, with his friend C. A. Rosetti and other young politicians (including his brother), in the 1848 Wallachian Revolution, and acted as prefect of police in the provisional government formed in that year.