- dahli
- darwini
- Data Deficient
- deciduous
- decorata
- decussata
- Deirochelys
- delticola
- deltopectoral
- Democratic Republic of Congo
- dentary bone
- dentata
- denticulata
- denticulate
- depressa
- dermal
- Dermatemys
- Dermochelys
- desmosomes
- dhongoka
- diademata
- dichotomy
- dichromatism
- dimorphic
- diploid
- Dipsochelys
- distal
- diurnal
- divergence
- DNA
- Dogania
- dorbignyi
- dorsal
- dorsalis
- dumerilianus
- dunni
- durangoense