| defensa | defense |
| Defensa Benoni | Benoni Defense |
| Defensa Bogoindia | Bogo-Indian Defence |
| Defensa Budapest | Budapest Defence |
| Defensa Caro-Kann | Caro-Kann Defence |
| Defensa Chewbacca | Chewbacca defense |
| Defensa de los almacenes Sihang | Defense of Sihang Warehouse |
| Defensa de los dos caballos | Two Knights Defense |
| Defensa de los siete sacramentos | Defence of the Seven Sacraments |
| Defensa Erizo | Hedgehog |
| Defensa escandinava | Scandinavian Defense |
| Defensa eslava | Slav Defense |
| Defensa Grünfeld | Grünfeld Defence |
| Defensa holandesa | Dutch Defence |
| Defensa húngara | Hungarian Defence |
| Defensa india antigua | Old Indian Defense |
| Defensa moderna | Modern Defense |
| Defensa Nimzo-India | Nimzo-Indian Defence |
| Defensa Nimzovitch | Nimzowitsch Defence |
| Defensa Philidor | Philidor Defence |
| Defensa Pirc | Pirc Defence |
| defensa propia | self-defense |
| Defensa siciliana | Sicilian Defence |
| Defense Advanced Research Projects Agency | DARPA |
| Defense of the Ancients | Defense of the Ancients |
| Defensina | Defensin |
| defensivo | defensive |
| defensor | lawyer |
| Defensor de derechos humanos | Human rights defender |
| Defensor del Pueblo Europeo | European Ombudsman |
| defensor público | public defender |
| Defensor Sporting Club | Defensor Sporting Club |
| defensora | lawyer |
| defensora pública | public defender |
| Defensores de la Tierra | Defenders of the Earth |
| Defensoría del Pueblo Europeo | European Ombudsman |
| deferencia | attention |
| deferente | deferential |
| deficiencia | deficiency |
| deficiente | poor |
| deficiente mental | mentally deficient |
