(prime minister) Ion Ghica
1866; 1866-1867; 1870-1871
(prime minister) Ion Emanuel Florescu
1876; 1891
(prime minister) Ion C. Brătianu
1876-1881; 1881-1888
(prime minister) Ion I. C. Brătianu
1909-1910; 1914-1918; 1918-1919; 1922-1926; 1927
(prime minister) Vintilă Brătianu (middle name Ion)
1927-1928
(prime minister) Ion G. Duca
1933
(prime minister) Ion Gigurtu
1940
(prime minister) Ion Antonescu
1940-1944
(prime minister) Ion Gheorghe Maurer
1961-1974
(president) Ion Iliescu
1989-1996; 2000-2004
(prime minister) Marcel Ciolacu (a.k.a. Ion)
2023-