Encyclopedias, Almanacs, Transcripts, and Maps
- Dhikr
- Dialogue of Religions
- Dias, Bartholomeu
- Diaz, Bartholomeu
- Diazinon
- Dichlorodiphenyl-Trichloroethane
- Didelphimorphia (New World Opossums)
- Die-Off
- Dieback
- Diesel Cycle Engines
- Diesel, Rudolph (1858–1913)
- Dieterich, Albrecht
- Dieterlen, Germaine
- differential calculus
- digital audio tape
- digital video disc
- Dignāga
- Diola Religion
- Dionysius the Areopagite
- Dionysos