| diocèse | bishopric |
| Diocèse catholique de Stockholm | Roman Catholic diocese of Stockholm |
| Diocèse de Bata | Roman Catholic Diocese of Bata |
| Diocèse de Coire | Bishop of Chur |
| Diocèse de Constantine | Roman Catholic Diocese of Constantine |
| Diocèse de Gap | Diocese of Gap |
| Diocèse de Laghouat | Roman Catholic Diocese of Laghouat |
| Diocèse de Lille | Diocesi di Lille |
| Diocèse de Liège | Bishopric of Liège |
| Diocèse de Man | Roman Catholic Diocese of Man |
| Diocèse de Manchester | Roman Catholic Diocese of Manchester |
| Diocèse de Mende | Archdiocese of Lyon |
| Diocèse de Metz | Diocese of Metz |
| Diocèse de Moulins | Diocese of Moulins |
| Diocèse de Moundou | Roman Catholic Diocese of Moundou |
| Diocèse de Moûtiers-Tarentaise | Ancient Diocese of Tarentaise |
| Diocèse de Namur | Diocese of Namur |
| Diocèse de Pékin et de toute la Chine | Chinese Orthodox Church |
| Diocèse de Saint-Gall | Roman Catholic Diocese of Sankt Gallen |
| Diocèse de Saint-Thomas | Roman Catholic Diocese of Saint Thomas |
| Diocèse de Shendam | Roman Catholic Diocese of Shendam |
| Diocèse de Sion | Roman Catholic Diocese of Sion |
| Diocèse de Strasbourg | Archbishopric of Strasbourg |
| Diocèse de Tournai | Diocese of Tournai |
| Diocèse de Tunis | Patriarchate of Carthage |
| Diocèse de Verdun | Diocese of Verdun |
| Diocèse de Yarmouth | Roman Catholic Diocese of Yarmouth |
| diocésain | diocesan |
| diode | diode |
| Diode de Gunn | Gunn diode |
| Diode Gunn | Gunn diode |
| Diode laser à cavité verticale émettant par la surface | Vertical-cavity surface-emitting laser |
| Diode PIN | PIN diode |
| Diode Schottky | Schottky diode |
| Diode Transil | Transil |
| diode varicap | varactor |
| Diode Zener | Zener diode |
| diode à capacité variable | varactor |
| Diode électroluminescente | Light-emitting diode |
| Diode électroluminescente organique | Organic light-emitting diode |
| Diodore Cronos | Diodorus Cronus |
| Diodore de Sicile | Diodorus Siculus |
| Diodore Ier de Jérusalem | Patriarch Diodoros of Jerusalem |
| Diodote | Diodotus I |
| Diogenidae | Diogenidae |
| Diogo Cão | Diogo Cão |
| Diogo Dias | Diogo Dias |
| Diogo Freitas do Amaral | Diogo Freitas do Amaral |
| Diogo Ortiz de Vilhegas | Diogo Ortiz de Villegas |
| Diogène | Diogenes |
| Diogène de Babylone | Diogenes of Babylon |
| Diogène de Sinope | Diogenes of Sinope |
| Diogène Laërce | Diogenes Laërtius |
| diol | diol |
| Diola | Jola people |
| Diomedea amsterdamensis | Amsterdam Albatross |
| Diomedeinae | Albatross |
| Diomidis Kiriakos | Diomidis Kiriakos |
| Diomède | Diomedes |
| Dion Cassius | Cassius Dio |
| Dion de Pruse | Dio Chrysostom |
| Dion de Syracuse | Dion of Syracuse |
| Dion Phaneuf | Dion Phaneuf |
| Dioncophyllaceae | Dioncophyllaceae |
| Dionigi Tettamanzi | Dionigi Tettamanzi |
| Dionisio Aguado | Dionisio Aguado |
| Dionne Warwick | Dionne Warwick |
| Dionysos | Dionysus |
| Dioné | Dione |
| dionée | sundew |
| Dionýsios Solomós | Dionysios Solomos |
| Diophane de Nicée | Diophanes of Nicaea |
| dioptase | dioptase |
| Dior | Dior Eluchíl |
| diorite | diorite |
| Dioscore | Antipope Dioscorus |
| Dioscoreaceae | Dioscoreaceae |
| Dioscoreales | Dioscoreales |
| Dioscoride | Pedanius Dioscorides |
| Dioscures | Castor and Pollux |
| Diosdado Macapagal | Diosdado Macapagal |
| Diospyros | Diospyros |
| Diospyros blancoi | Mabolo |
| Diospyros virginiana | American persimmon |
| Diotime | Diotima of Mantinea |
| Dioula | Dioula language |
| Diourbel | Diourbel Region |
| dioxine | dioxin |
