• Catinus Adams, 1853 (uncertain) [Family: Mollusca (awaiting allocation)]
• Catinus Fabricius, 1823 (uncertain) [Family: Mollusca (awaiting allocation)]
• Catinus Oken, 1835 accepted as Sinum Röding, 1798 [Family: Naticidae]
• Centenus Gray, 1837 accepted as Tenrec Lacepède, 1799
• Centrinus Schönherr, 1825
• Chortinus Aldrich, 1932
• Cocytinus Cope, 1871 † (uncertain)
• Coelinus Szépligeti, 1904 (unaccepted)
• Colinus Goldfuss, 1820 [Family: Odontophoridae]
• Colinus Lesson, 1828 accepted as Perdix Brisson, 1760 [Family: Phasianidae]
• Colinus Navás, 1925 (uncertain) [Family: Neuroptera (awaiting allocation)]
• Conicus Motschoulsky, 1844 accepted as Harpalus Latreille, 1802 [Family: Carabidae]
• Conicus Paetel, 1875 (unaccepted) [Family: Mollusca (awaiting allocation)]
• Conidus Alonso-Zarazaga & Lyal, 1999
• Conipinus Leconte, 1862 accepted as Eusattus Leconte, 1851
• Conoixus Reitter, 1906 accepted as Canoixus Roelofs, 1873
• Contilus Agassiz, 1842 (unaccepted > nomen nudum)
• Contina Di Cencio, 2016 †
• Continia Hartig, 1976 (uncertain)
• Contipus de Marseul, 1853 accepted as Hister Linnaeus, 1758
• Contopus Cabanis, 1855 [Family: Tyrannidae]
• Contopus Gemminger & Harold, 1868 accepted as Contipus de Marseul, 1853 accepted as Hister Linnaeus, 1758 [Family: Histeridae]
• Contusus Whitley, 1947
• Conulinus Martens, 1895 (uncertain)
• Cophinus König in Murchison, 1839 †
• Coprinus Persoon, 1797
• Coptonus Kuschel in Kuschel, Leschen & Zimmerman, 2000 (uncertain)
• Corminus Burmeister, 1855
• Cotinus P. Miller, 1754
• Cottonus Hoser, 2009 accepted as Aechmophrys Coues, 1875
• Cottonus Hoser, 2012 accepted as Crotalus Linnaeus, 1758
• Coulinus Beirne, 1955
• Cratinus Steindachner, 1878
• Cyrtinus Leconte, 1852
• Cytinus Linnaeus, 1764
• Fontinus Jordan & Evermann, 1896 accepted as Fundulus Lacepède, 1803
• Pontinus Poey, 1860