- Circumnavigator
- Circus
- ...
- Civil Service
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- Civil War, American
- ...
- Clemens, Samuel Langhorne
- Clemens, Titus Flavius
- ...
- Clermont-Tonnerre
- Cleveland (Ohio)
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- Cleveland, Frederick Albert
- Cleveland, Grover
- Cleveland Heights
- ...
- Clymer, George
- Clynes, John Robert
- Clyster
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- Coagulation
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- Coaldale
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- ...
- Collier, John Payne
- Collier, Peter Fenelon
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- Collier, William
- ...
- Colophony
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- Color Blindness
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- Color Photography
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- Colossæ
- Colossians, Epistle to the
- Colossus
- Colporteur
- Colquhoun, Archibald Ross
- Colt, Le Baron Bradford
- Colt, Samuel
- Coltsfoot
- Coluber
- Columba
- Columba, St.
- Columbanus, St.
- Columbarium
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- Columbus, Christopher
- ...
- Colure
- Colvin, Sir Sidney
- Colvocoresses, George Partridge
- ...
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- Concini, Concino
- Conclave
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- Concord (Mass.)
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- Concordance
- ...
- Conjuring
- Conkling, Roscoe
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- Connolly, James Brendan
- Conoid
- ...
- Cook Strait
- Cooley, Thomas McIntyre
- Coolidge, Calvin
- Cooper, James Fenimore
- Cooper, Peter
- Co-operation
- Cooper Union
- Coorg
- ...
- Cotopaxi
- Cotswold Hills
- Cotton
- Cotton-Grass
- Cotton Insects
- ...
- Coverdale, Miles
- Covington
- Cow
- ...
- Cowper, William
- Cow plant
- Cowry
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- Cox, Isaac Joslin
- Cox, Jacob Dolson
- Cox, James Middleton
- Cox, Kenyon
- ...
- Crab Apple
- Crabbe, George
- Crab spider
- Cracow
- Cradle
- Cradle of Liberty
- Crafts, Wilbur Fisk
- ...
- Ctesiphon
- Ctesiphon, Battle of
- Cuando
- Cuba
- Cube
- Cubeb
- Cubeba
- Cubists
- Cubit
- Cubitt, Sir William
- Cuckoo
- Cuckoo Flower
- Cucumber
- Cúcuta, San José de
- Cuddalore
- Cuddapah
- Cuenca
- Cuernaváca
- Cufic
- ...
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- Cyclometer
- Cyclopædia
- Cyclops
- ...
- Cyrus (The Elder)
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- Cytheron
- Cytisus
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- Czechs
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- Czernowitz
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- Czolgosz, Leon
- D
- ...
- D'Alembert, Jean le Rond
- Dalhousie, . . . , 1st Marquis of
- Dallas
- Dallas, George Mifflin
- ...
- Dannevirke
- D'Annunzio, Gabriele
- Dante Alighieri
- Danton, Georges Jacques
- ...
- Declaration
- Declaration of Independence
- Declaration of Rights
- Declension
- ...
- Delano, Frederic Adrian
- De la Ramée, Louise
- Delaroche, Hippolyte
- Delavigne, Jean Francois Casimir
- Delaware (State)
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- Delbrück, Martin Friedrich Rudolf von
- Deleb palm
- Delegate
- ...
- Denis
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- Dennewitz
- Denney, Joseph Villiers
- Dennison
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- Denny, George Hutcheson
- Density
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- Dentex
- Dentin
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- Dennison
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- Denudation
- Denver
- Denver, University of
- ...
- Desmodium
- Des Moines
- Des Moines College
- ...
- Detritus
- Detroit
- Detroit River
- ...
- Dichroite
- Dickens, Charles
- Dickinson, Emily
- Dickinson, Goldsworthy Lowes
- ...
- Dictator
- Dictionary
- Dictophone
- ...
- Diemen, Anton Van
- Dieppe
- Diesel, Rudolf
- Diesel Engine
- Die-sinking
- Diet (meeting)
- Differential Calculus
- ...
- District, Congressional
- District Court
- District of Columbia
- Ditch
- ...
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- Doniphan, Alexander William
- Donizetti, Gaetano
- Donjon
- Don Juan
- Donkey Engine
- Donne, John
- Donnelly, Ignatius
- Donnybrook
- Donora
- Don Quixote
- Doom
- Doon
- Door
- Doorga
- Doornboom
- Dopplerite
- ...
- Dordrecht
- Doré, Paul Gustave
- Doremus, Robert Ogden
- Doria
- Dorians
- ...
- Dougherty, Dennis J.
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- ...
- Douro
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- Dove
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- Dover (New Hampshire)
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- Dover (Ohio)
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- Dover's Powder
- Dow, Arthur Wesley
- ...
- Drainage Tubes
- Drake, Sir Francis
- Drake, Franklin Jeremiah
- Drake, Joseph Rodman
- Drake, Samuel Adams
- Drakenberge
- Drake University
- Drama
- ...
- Dredging
- Dred Scott Case
- Dreiser, Theodore
- Dresden
- Dresden, Battle of
- Dresden China
- Dresser
- ...
- Drosometer
- Drown, Thomas Messinger
- Drowning
- ...
- Dulcimer
- Du Lhut, Daniel Greysolon
- Duluth
- ...
- Eads, James Buchanan
- Eagle
- ...
- Ebbsfleet
- Ebenezer
- Ebers, Georg Moritz
- Ebert, Friedrich
- Ebro
- ...
- Eczema
- Eddy, Mary Baker Glover
- Eddy, Spencer
- Eden
- ...
- Einbeck
- Einsiedeln
- Einstein, Albert
- Eisner, Kurt
- Ekaterinoslav
- Ekron
- ...
- Elizabeth, Saint
- Elkhart
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