Encyclopedias, Almanacs, Transcripts, and Maps
- ductless gland
- Dudamel, Gustavo
- Dudevant, Amandine Aurore Lucie Dupin, baronne
- Dudinka
- Dudley, John
- Dudley, Joseph
- Dudok, William
- Duer, William
- Duero
- Duff Cooper, Alfred
- Duff, Sir Lyman Poore
- Dufferin and Ava, Frederick Temple Hamilton-Temple-Blackwood, 1st marquess of
- Dufour, Guillaume Henri
- Dufourspitze
- Duggah
- Duguay-Trouin, René
- Duhamel du Monceau, Henri Louis
- Duhem, Pierre Maurice Marie
- Dühring, Eugen Karl
- Duke of York Islands