| D region ... Dagobert I |
| Dagobert II ... Dallam, Thomas |
| Dallan Forgaill ... damsel bug |
| damselfish ... Danzi, Franz |
| Daodejing ... darshan |
| Dart, Raymond A. ... Dauser, Sue Sophia |
| Dausset, Jean ... Davis, Miles |
| Davis, Mount ... De Geer, Charles |
| De Geer, Gerhard, Friherre ... Deba Habe |
| DeBakey, Michael ... Dee, River |
| Dee, River ... Delane, John Thaddeus |
| Delaney, Shelagh ... Delta |
| Delta Air Lines, Inc. ... dendrochronology |
| Dendrocolaptidae ... Dera Ghazi Khan |
| Dera Ismail Khan ... desert pavement |
| Desert Rats ... Deuteronomy |
| Deuterostomia ... Dezhnyov, Semyon Ivanov |
| Dga'-ldan ... Diamond Sutra |
| Diamond, Cape ... Dickinson, Emily |
| Dickinson, John ... Dieulafoy, Marcel-Auguste |
| Dievs ... Dimitrijevic, Dragutin |
| Dimitrios ... Dionysian period |
| Dionysius Exiguus ... Dirichlet, Peter Gustav Lejeune |
| Dirk Hartog Island ... Divine, Father |
| diving ... Dobzhansky, Theodosius |
| Doccia porcelain ... dolce stil nuovo |
| Dolci, Carlo ... domino |
| domino theory ... Door Peninsula |
| Doorman, Karel ... Dottore |
| dou ... Dow Jones average |
| Dow, Charles Henry ... Drang nach Osten |
| Draper, Charles Stark ... driving and coaching |
| drizzle ... DSM |
| Du Bois, W.E.B. ... Dudley, Charles Benjamin |
| Dudley, Dud ... Dumfries |
| Dumfries and Galloway ... Dunsinane |
| Dunstable ... Durham |
| Durham, John George Lambton, 1st earl of ... dwarf |
| dwarf mistletoe ... |
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