- Claymore
- Clays, Paul Jean
- Clayton, John Middleton
- Clayton-Bulwer Treaty
- Clay-with-Flints
- Clazomenae
- Cleanthes
- Clearchus
- Clearfield
- Clearing-house
- Cleat
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- Cleavers
- Cleburne
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- Cleethorpes
- Cleft Palate
- Cleisthenes
- Cleitarchus
- Cleithral
- Cleitor
- Cleland, William
- Clematis
- Clemenceau, Georges
- Clemencín, Diego
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- Clement (popes)
- Clement of Alexandria
- Clément, François
- Clément, Jacques
- Clementi, Muzio
- Clementine Literature
- Cleobulus
- Cleomenes
- Cleon
- Cleopatra
- Clepsydra
- Clerestory
- Clerfayt
- Clergy
- Clergy, Benefit of
- Clergy Reserves
- Clerk
- Clerke, Agnes Mary
- Clerkenwell
- Clermont-en-Beauvaisis
- Clermont-Ferrand
- Clermont-Ganneau, Charles Simon
- Clermont-l'Herault
- Clermont-Tonnerre (family)
- Clermont-Tonnerre, Stanislas
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- Cleruchy
- Clervaux
- Cletus
- Clevedon
- Cleveland, Barbara Villiers
- Cleveland, John
- Cleveland, Stephen Grover
- Cleveland
- Clever
- Cleves
- Cleynaerts
- Clichtove, Josse van
- Clichy
- Cliff-dwellings
- Clifford (English Family)
- Clifford, John
- Clifford, William Kingdon
- Clifford of Chudleigh, Thomas Clifford, 1st Baron
- Clifton
- Clim
- Climacteric
- Climate and Climatology
- Climax, John
- Climbing
- Clinchant, Justin
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- Clinic; Clinical
- Clinker
- Clinoclasite
- Clinton, De Witt
- Clinton, George
- Clinton, Sir Henry
- Clinton, Henry Fynes
- Clinton (Iowa)
- Clinton (Massachusetts)
- Clinton (Missouri)
- Clinton (New York)
- Clintonite
- Clisson, Olivier de
- Clisson
- Clitheroe
- Clitomachus
- Clitumnus
- Clive, Caroline
- Clive, Catherine
- Clive, Robert Clive, Baron
- Cloaca
- Clock
- Clodia, Via
- Clodius
- Clogher
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