D
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- Dace
- Daddy Longlegs
- Daedalus
- Daffodil
- Dafoe, John Wesley
- Daguerre, Louis Jacques Mande
- Daguerreotype
- Dahlgren, John Adolph
- Dahlia
- Dahomey
- Dairy Husbandry
- Daisy
- Dakota River
- Dale, Sir Thomas
- Dallas, George Mifflin
- Dallas, Texas
- Dalmatia
- Dalton, Georgia
- Dalton, John
- Dam
- Damages
- Damascus
- Damien, Father
- Damocles
- Damon and Pythias
- Damrosch, Leopold
- Damrosch, Walter Johannes
- Damson
- Dan
- Dan, Canaan
- Dana, Charles Anderson
- Dana, James Dwight
- Dana, Richard Henry, Jr.
- Danbury, Connecticut
- Dancing
- Dandelion
- Dandie Dinmont
- Daniel
- Daniell Battery
- Dante, Alighieri
- Danton, George Jacques
- Danube
- Danvers, Massachusetts
- Danville, Illinois
- Danville, Pennsylvania
- Danville, Virginia
- Danzig
- Dardanelles
- Darien, Gulf of
- Darius I
- Darius III
- Dark Ages
- Darling, Grace Horsley
- Darling River, Australia
- Darnley, Henry Stuart, LORD
- Darter
- Dartmouth, College
- Darwin, Charles Robert
- Daskam, Josephine Dodge
- Date, or Date Palm
- Daubigny, Charles Francois
- Daudet, Alphonse
- Daughters of the American Revolution
- Davenport, Iowa
- David
- David, Jacques Louis
- Davies, Sir Louis Henry
- Davis, Cushman Kellogg
- Davis, David
- Davis, Jefferson
- Davis, Rebecca Blaine Harding
- Davis, Richard Harding
- Davis Strait
- Davy, Sir Humphry
- Dawes, Henry Laurens
- Dawson, Canada
- Dawson, George Mercer
- Dawson, Sir John William
- Dawson, William Bell
- Day
- Day, William Rufus
- Day Lily
- Dayton, Kentucky
- Dayton, Ohio
- Deaconess
- Dead Letter Office
- Dead Sea
- Deaf
- Deak, Ferencz
- Deane, Silas
- Dearborn, Henry
- Death's-Head Moth
- Deathwatch Beetle
- Deborah
- Debs, Eugene Victor
- Debt
- Decatur, Stephen
- Decatur, Illinois
- Decatur, Indiana
- December
- Declaration of Independence
- Declination
- Decoration Day
- Dedham, Massachusetts
- Deductive Method
- Deed
- Deer
- Deer Mouse
- Defiance, Ohio
- Defoe, Daniel
- Degree
- Degrees
- De Kalb, Illinois
- De Kalb, Johann
- De Koven, Henry
- Delacroix, Ferdinand
- DeFagoa Bay
- Deland, Margaretta
- Delaware
- Delaware, Ohio
- Delaware, Thomas West
- Delaware and Hudson Canal
- Delaware Bay
- Delaware, University of
- Delaware River
- Delcasse, Theophile
- Delhi, India
- Delirium Tremens
- Delphi, Oracle of
- Delta
- De Mille, James
- Democracy
- Democratic Donkey
- Democratic Rooster
- Democritus
- De Morgan, William Frend
- Demosthenes
- Demurrer
- Denison, Texas
- Denmark
- Dentistry
- Denver, Colorado
- Denver, University of
- Department
- DePew University
- Depew, Chauncey Mitchell
- De Quincey, Thomas
- Derby, Connecticut
- Derby, Frederick Arthur
- Derrick
- Dervish
- Descartes, Rene
- Descent
- Desert
- Des Moines, Iowa
- Des Moines River
- De Soto, Fernando
- Detroit, Michigan
- Detroit River
- Deucalion
- Deucalion
- Deuteronomy
- Devil
- Devilfish
- Devils Lake
- Dew
- Dewberry
- Dewey, George
- Dewey, John
- Dewey, Melvil
- Dew Point
- Diamond
- Diana, in Greek
- Diana, Temple of
- Diaphragm
- Dias, Bartholomeu
- Diatom
- Diaz, Narcisse Virgille
- Diaz, Porfirio
- Dice
- Dicentra
- Dickcissel
- Dickens, Charles
- Dickson, Pennsylvania
- Dictagraph
- Dictator
- Dictionary
- Dickinson, John
- Diderot, Denis
- Dido
- Die and Die Sinking
- Diffraction
- Diffusion
- Digestion
- Dike
- Dill
- Dingley, Nelson, Jr.
- Dingo
- Dinornis
- Dinosauria
- Dinotherium
- Dinwiddie, Robert
- Diocletian
- Diogenes
- Diomedes
- Dionysius
- Diphtheria
- Diplomacy
- Dipper
- Dipping Needle
- Diptera
- Directory of France
- Discordia
- Diseases of Plants
- Disinfectant
- Disk Harrow
- Dismal Swamp
- Dispersion of Light
- Disraeli, Benjamin
- Distillation
- Distilled Liquors
- Distribution
- District Court
- Diver
- Divides
- Divination
- Diving
- Division of Labor
- Divorce
- Dix, John Adams
- Dixie
- Dixon, Illinois
- Dixon, Thomas
- Dnieper River
- Dniester River
- Dobson, Henry
- Dock
- Dodder
- Dodge, Grenville Mellen
- Dodge, Mary Abigail
- Dodge, Mary Elizabeth
- Dodgson, Charles Lutwidge
- Dodo
- Dog
- Dogbane
- Dog Days
- Dogfish
- Dog Star
- Dogtooth Spar
- Dogwood
- Doldrums
- Dole, Nathan Haskell
- Dole, Sanford Ballard
- Dollar
- Dollinger, Johann
- Dolliver, Jonathan
- Dolomite
- Dolphin
- Domesday
- Domestication of Animals
- Domestic Science
- Dominic, Saint
- Dominical Letter
- Dominicans Friar Preachers
- Dominoes
- Don River
- Donatello
- Don Carlos
- Donkey
- Donnelly, Ignatius
- Donora, Pennsylvania
- Don Quixote
- Dooley, Mr.
- Doom Palm
- Doppler's Principle
- Dover, New Hampshire
- Dover, New Jersey
- Dover, Strait of
- Dow, Neal
- Dowden, Edward
- Dowie, John Alexander
- Doyle, Sir Arthur Conan
- Draco
- Draft
- Dragon Fly
- Drainage
- Drake, Sir Francis
- Drake, Joseph Rodman
- Drakensberg
- Drama
- Draper, Andrew Sloan
- Draper, John William
- Drave River
- Drawbridge
- Drawing
- Draw Poker
- Dredger
- Dred Scott Case
- Dreibund
- Dresden, Germany
- Dress
- Drew, John
- Drexel Institute of Art
- Drift
- Dromedary
- Dropsy
- Drowning
- Druggist
- Drugs
- Druids
- Drum
- Drummond, Henry
- Dryads
- Dry Battery
- Dryden, John
- Dry-Farming
- Dry Kiln
- Dry Rot
- Dry Tortugas
- Dublin
- Dublin, Georgia
- Dublin, University of
- Dubois, Pennsylvania
- Du Boi, William Edward
- Dubuque, Iowa
- Du Chaillu, Paul
- Duck
- Duckbill Platypus
- Duckweed
- Dudevant, Amandine
- Dudley, Thomas
- Due Bill
- Duel
- Dufferin and Ava
- Dugong
- Dulcimer
- Duluth, Minnesota
- Duma
- Dumas, Alexandre
- Dumas, Alexandre, the Younger
- Dumdum, India
- Dumouriez, Charles Francois
- Dunbar, Paul Laurence
- Dundee, Ireland
- Dune
- Dunedin, New Zeland
- Dunkers
- Dunkirk, New York
- Dunlin
- Dunmore, John Murray
- Dunmore, Pennsylvania
- Dunne, Finey Peter
- Duns Scotus, John
- Dunstan, Saint
- DuPont, Samuel Francis
- Dupre, Jules
- Duquesne, Pennsylvania
- Durban, Natal
- Durbar
- Durer, Albrecht
- Durham, John George
- Durham, North Carolina
- Duse, Eleonora
- Dusseldorf
- Dust
- Dustin, Hannah
- Dutch East Indies
- Dutchman's Breeches
- Dutch Metal
- Dvina River
- Dvorak, Antonin
- Dwarfs
- Dwight, Timothy
- Dwight, Timothy
- Dyaks
- Dyeing
- Dyer's Weed
- Dynamics
- Dynamite
- Dynamo
- Dynamometer
- Dyne
