Encyclopedias, Almanacs, Transcripts, and Maps
- Duchenne, Guillaume Benjamin Amand
- Duchesne, Louis Marie Olivier
- Duchesne, Saint Rose Philippine
- duck hawk
- Duck Lake
- duckbill (fish)
- duckbill (marsupial)
- Duclos, Jacques
- Ducommun, Élie
- 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