| duetto | duet |
| Duff Beer | Duff Beer |
| Duff McKagan | Duff McKagan |
| DUG | Dew |
| Duggendorf | Duggendorf |
| Duggingen | Duggingen |
| Dugong dugon | Dugong |
| dugongo | dugong |
| Duillier | Duillier |
| Duino-Aurisina | Duino |
| Duisburg | Duisburg |
| Duke Ellington | Duke Ellington |
| Dukkha | Dukkha |
| Dukla Praga | Dukla Praha |
| DUKW | DUKW |
| dulcamara | bittersweet |
| dulciana | dulcian |
| Dulcigno | Ulcinj |
| dulcimelo | dulcimer |
| Dulcimer | Appalachian dulcimer |
| dulcimero | dulcimer |
| Dulliken | Dulliken |
| Duloxetina | Duloxetine |
| duma | duma |
| Duma di Stato | State Duma |
| Dumas | Dumas |
| Dumbarton Rock | Dumbarton Castle |
| Dumfries e Galloway | Dumfries and Galloway |
| Dumnoni | Dumnonii |
| Dumnonia | Domnonia |
| Dumnorige | Dumnorix |
| Dumortierite | Dumortierite |
| dumoso | brambly |
| Dump | Catch-phrase |
| Dumuzi | Tammuz |
| Dun Laoghaire-Rathdown | Dun Laoghaire-Rathdown |
| duna | dune |
| Duna del Pyla | The Great Dune of Pyla |
| Dunajov | Dunajov |
| Dunbartonshire Occidentale | West Dunbartonshire |
| Dunbartonshire Orientale | East Dunbartonshire |
| Duncan | Duncan |
| Duncan I di Scozia | Duncan I of Scotland |
| Duncan Idaho | Duncan Idaho |
| Duncan II di Scozia | Duncan II of Scotland |
| Duncan Pantano | Quagmire triplets |
| Dunclivo | Dunharrow |
| Dundalk | Dundalk |
| Dundee | Dundee |
| Dune | Dune |
| dune di sabbia | sand dune |
| Dune II | Dune II |
| Dunedin | Dunedin |
| Dunga | Dunga |
| Dungani | Dungan |
| Dungeon | Dungeon crawl |
| Dunhuang | Dunhuang |
| Dunkelsteinerwald | Dunkelsteinerwald |
| Dunkerque | Dunkirk |
| Dunkleosteus | Dunkleosteus |
| Dunland | Dunland |
| Dunlop | Dunlop Tyres |
| Dunningen | Dunningen |
| Dunois | Jean de Dunois |
| dunque | thus |
| Duns Scoto | Duns Scotus |
| Dunum | Dunam |
| Dunvallo Molmuzio | Dunvallo Molmutius |
| Dunwich | Dunwich |
| duo | duet |
| duodecima | twelfth |
| duodecimale | duodecimal |
| Duodecimani | Twelvers |
| duodenale | duodenal |
| duodenite | duodenitis |
| duodeno | duodenum |
| Duologia | Duology |
| duomo | cathedral |
| Duomo di Colonia | Cologne Cathedral |
| Duomo di lava | Lava dome |
| Duomo di Lucca | Lucca Cathedral |
| Duomo di Magonza | Mainz Cathedral |
| Duomo di Mantova | Mantua Cathedral |
| Duomo di Milano | Milan Cathedral |
| Duomo di Modena | Modena Cathedral |
| Duomo di Monza | Iron Crown of Lombardy |
| Duomo di Orvieto | Orvieto Cathedral |
| Duomo di Pisa | Cathedral |
| Duomo di Prato | Prato Cathedral |
| Duomo di Riga | Riga Cathedral |
| Duomo di Torino | Turin Cathedral |
| Duomo di Ulma | Ulm Cathedral |
| Duplek | Duplek |
| duplicare | double |
| Duplicata | Dupicate |
| duplicato | copy |
| duplicatore | duplicator |
