Namesakes
Constantin Brâncuși
(m) 1876-1957 
Notable Artists
Constantin Fehrenbach
(m) 1852-1926
German Chancellors and Presidents 1920-1921 (chancellor)
Călin Popescu-Tăriceanu
(middle name Constantin) (m) 1952-
Romanian Presidents and Prime Ministers 2004-2008 (prime minister)
Ion I. C. Brătianu
(middle name Constantin) (m) 1864-1927
Romanian Presidents and Prime Ministers 1909-1910; 1914-1918; 1918-1919; 1922-1926; 1927 (prime minister)
Ion C. Brătianu
(middle name Constantin) (m) 1821-1891
Romanian Presidents and Prime Ministers 1876-1881; 1881-1888 (prime minister)
Étienne Constantin de Gerlache
(m) 1785-1871
Belgian Prime Ministers 1831
Constantin Dăscălescu
(m) 1923-2003
Romanian Presidents and Prime Ministers 1982-1989 (prime minister)
Mugur Isărescu
(a.k.a. Constantin) (m) 1949-
Romanian Presidents and Prime Ministers 1999-2000 (prime minister)
Constantin Sănătescu
(m) 1885-1947
Romanian Presidents and Prime Ministers 1944 (prime minister)
Marius Niculae
(middle name Constantin) (m) 1981-
Notable Athletes (soccer)
Constantin Coandă
(m) 1857-1932
Romanian Presidents and Prime Ministers 1918 (prime minister)
Constantin Argetoianu
(m) 1871-1955
Romanian Presidents and Prime Ministers 1939 (prime minister)
Vintilă Brătianu
(middle name Constantin) (m) 1867-1930
Romanian Presidents and Prime Ministers 1927-1928 (prime minister)
Tobias Hauke
(middle name Constantin) (m) 1987-
Olympic Medalists 2008; 2012 field hockey (gold)
Constantin Bosianu
(m) 1815-1882
Romanian Presidents and Prime Ministers 1865 (prime minister)
Constantin of Liechtenstein
(m) 1972-
Other Royalty 1972- Liechtenstein (prince)
Constantin Crețulescu
(m) 1809-1884
Romanian Presidents and Prime Ministers 1867 (prime minister)
Alfons of Liechtenstein
(middle name Constantin) (m) 2001-
Other Royalty 2001- Liechtenstein (prince)
Georg of Liechtenstein
(middle name Constantin) (m) 1999-
Other Royalty 1999- Liechtenstein (prince)