- Cockburn, Sir Alexander James Edmund
- Cockburn, Alicia
- Cockburn, Sir George
- Cockburn, Henry Thomas
- Cocker, Edward
- Cockerell, Charles Robert
- Cockerill, William
- Cockermouth
- Cock-fighting
- Cock Lane Ghost
- Cockle, Sir James
- Cockle
- Cockney
- Cock-of-the-Rock
- Cockpit
- Cockroach
- Cock's-comb
- Cockton, Henry
- Cockx, Hieronymus
- Cocoa
- Coco de Mer
- Cocoma
- Coco-nut Palm
- Cocytus
- Cod
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- Coda
- Code
- Code Napoléon
- Codiaeum
- Codicil
- Codilla
- Codinus, George
- Cod-liver Oil
- Codrington, Christopher
- Codrington, Sir Edward
- Codrus
- Cody, William Frederick
- Co-education
- Coeffeteau, Nicolas
- Coehoorn, Menno, Baron van
- Coelentera
- Coello, Alonso Sanchez
- Coello, Antonio
- Coelom and Serous Membranes
- Coen, Jan Pieterszoon
- Coenaculum
- Cœnwulf
- Coercion
- Cœur, Jacques
- Cœur d'Alêne
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- Coke, Sir John
- Coke, Thomas
- Coke
- Col
- Colbert, Jean Baptiste
- Colbert de Croissy, Charles
- Colburn, Henry
- Colburn, Zerah
- Colby, Thomas Frederick
- Colchagua
- Colchester, Charles Abbot, 1st Baron
- Colchester
- Colchester (Vermont)
- Colchicum
- Colchis
- Colcothar
- Cold
- Colden, Cadwallader
- Cold Harbor
- Coldstream
- Coldwater
- Cole, Sir Henry
- Cole, Thomas
- Cole, Timothy
- Cole, Vicat
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