- Cons, Emma
- Conservation Policy
- Constans, Jean Antoine Ernest
- Constantine
- Convoy
- Conway, Sir William Martin
- Cook, Sir Edward Tyas
- Cook, Sir Joseph
- Coolidge, Calvin
- Cooper, Sir Richard Powell
- Coöperation
- Copper
- Cordonnier, Victor Louis Émilien
- Cornell University
- Coronel
- Corson, Hiram
- Costa Rica
- Cost of Living
- Cotton, Sir Henry John Stedman
- Cotton, James Sutherland
- Cotton, and Cotton Industry
- Couperus, Louis
- Courthope, William John
- Courtney, Leonard Henry Courtney, Baron
- Courtrai, Battle of
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- Coventry, England
- Cowdray, Weetman Dickinson Pearson, 1st Viscount
- Cox, James Middleton
- Cox, Kenyon
- Cozens-Hardy, Herbert Hardy Cozens-Hardy, 1st Baron
- Crackanthorpe, Montagu Hughes
- Cradock, Sir Christopher George Francis Maurice
- Cram, Ralph Adams
- Cramp, Charles Henry
- Cramp, Concemore Thomas
- Crane, Walter
- Crawford and Balcarres, 26th Earl of
- Crewe, Robert Offley Ashburton Crewe-Milnes, 1st Marquess of
- Cricket
- Crile, George Washington
- Croce, Benedetto
- Crockett, Samuel Rutherford
- Cromarty
- Cromer, Evelyn Baring, 1st Earl of
- Cronje, Piet Arnoldus
- Crookes, Sir William
- Crooks, William
- Crothers, Samuel McChord
- Crowder, Enoch Herbert
- Crozier, John Baptist
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- Crozier, John Beattie
- Crozier, William
- Crystallography
- Csaky, Albin, Count
- Cuba
- Cummings, William Hayman
- Cummins, Albert Baird
- Cunliffe, Walter, 1st Baron
- Cunningham, William
- Cunninghame-Graham, Robert Bontine
- Currie, Sir Arthur
- Curtis, Cyrus Hermann Kotzschmar
- Curzon of Kedleston, George Nathaniel Curzon, 1st Marquess
- Cushing, Harvey
- Cust, Henry John Cockayne
- Cytology
- Czechoslovakia
- Czernin, Ottokar, Count
- D'Abernon, Edgar Vincent, 1st Baron
- Dahn, Julius Sophus Felix
- Dahomey
- Dail Eireann
- Damrosch, Walter Johannes
- Dancing
- Daniels, Josephus
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- Dankl, Viktor, Freiherr von
- D'Annunzio, Gabriele
- Danzig
- Dardanelles Campaign
- Darling, Sir Charles John
- Dartmouth College
- Darwin, Sir George Howard
- Dato, Eduardo
- Daudet, Léon
- Daumet, Pierre Jerome Honoré
- Davids, Thomas William Rhys
- Davidson, Randall Thomas
- Davies, Henry Walford
- Davies, Hubert Henry
- Davies, John Llewelyn
- Davies, Sarah Emily
- Davies, William Henry
- Davis, Henry William Banks
- Davis, Richard Harding
- Davison, Henry Pomeroy
- Dawkins, Sir William Boyd
- Dawson of Penn, Bertrand Edward Dawson, 1st Baron
- Daylight Saving and Summer Time
- Deaf and Dumb
- Deakin, Alfred
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