- Columbani, Placido
- Columbarium
- Columbia (Missouri)
- Columbia (Pennsylvania)
- Columbia (South Carolina)
- Columbia (Tennessee)
- Columbia River
- Columbia University
- Columbine (pantomime)
- Columbine (plant)
- Columbite
- Columbium
- Columbus, Christopher
- Columbus (Georgia)
- Columbus (Indiana)
- Columbus (Mississippi)
- Columbus (Ohio)
- Columella, Lucius Junius Moderatus
- Column
- Colure
- Coluthus
- Colville, John
- Colvin, John Russell
- Colvin, Sidney
- Colwyn Bay
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- Colza Oil
- Coma
- Coma Berenices
- Comacchio
- Comana (Cappadocia)
- Comana (Pontus)
- Comanches
- Comayagua
- Comb
- Combaconum
- Combe, Andrew
- Combe, George
- Combe, William
- Combe
- Combermere, Stapleton Cotton, 1st Viscount
- Combes, Émile
- Combination
- Combinatorial Analysis
- Combustion
- Comedy
- Comenius, Johann Amos
- Comet
- Comet-seeker
- Comilla
- Comines
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- Comitia
- Comity
- Comma
- Commandeer
- Commander
- Commandery
- Commando
- Commemoration
- Commendation
- Commentarii
- Commentry
- Commerce
- Commerce (card-game)
- Commercial Court
- Commercial Law
- Commercial Treaties
- Commercy
- Commers
- Commines, Philippe de
- Commissariat
- Commissary
- Commission
- Commissionaire
- Commissioner
- Commitment
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- Committee
- Commodianus
- Commodore
- Commodus, Lucius Aelius Aurelius
- Common Law
- Common Lodging-house
- Common Order, Book of
- Commonplace
- Common Pleas, Court of
- Commons
- Commonwealth
- Commune
- Commune, Medieval
- Communism
- Commutation
- Comnenus
- Como (city)
- Como (lake)
- Comonfort, Ignacio
- Comorin, Cape
- Comoro Islands
- Companion
- Company
- Comparative Anatomy
- Comparetti, Domenico
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