| luneto | fanlight |
| Lungern | Lungern |
| Lunojod | Lunokhod programme |
| Lunokhod | Lunokhod programme |
| lunático | lunatic |
| Lunéville | Lunéville |
| Luo Guanzhong | Luo Guanzhong |
| Luoyang | Luoyang |
| lupa | magnifier |
| lupanar | brothel |
| Lupang Hinirang | Lupang Hinirang |
| Lupembiense | Lupemban culture |
| Luperca | Capitoline Wolf |
| Lupercales | Lupercalia |
| lupia | burl |
| Lupin III | Lupin III |
| lupino | lupin |
| Lupinus albus | Lupinus albus |
| Lupinus angustifolius | Lupinus angustifolius |
| Lupinus polyphyllus | Lupinus polyphyllus |
| Lupo | Lupo |
| Lupus | Lupus |
| Luronium | Luronium |
| Luros | Lurs |
| Lusacia | Lusatia |
| Lusaka | Lusaka |
| Luscinia luscinia | Thrush Nightingale |
| Luscinia megarhynchos | Nightingale |
| Lushootseed | Lushootseed |
| Lusignan | Lusignan dynasty |
| Lusitania | Lusitania |
| Lusitanos | Lusitanians |
| Lusofonía | Lusophone |
| Lussery-Villars | Lussery-Villars |
| Lussy-sur-Morges | Lussy-sur-Morges |
| Lustenau | Lustenau |
| lustrar | slick |
| lustre | polish |
| lustroso | brilliant |
| Luta Livre | Luta Livre |
| lutecio | lutetium |
| Lutenica | Ljutenica |
| Luteranismo | Lutheranism |
| luterano | Lutheran |
| Lutetia | Lutetia |
| Luther | Luther |
| Luther Blissett | Luther Blissett |
| Luthern | Luthern |
| luto | grief |
| Luton | Luton |
| Lutra | Lutra |
| Lutreolina crassicaudata | Lutrine Opossum |
| lutria | otter |
| Lutry | Lutry |
| Lutróforo | Loutrophoros |
| Luttenberger*Klug | Luttenberger*Klug |
| Lutz Schwerin von Krosigk | Lutz Graf Schwerin von Krosigk |
| Luven | Luven |
| lux | lux |
| luxación | dislocation |
| luxación del menisco | cartilage trouble |
| Luxair | Luxair |
| Luxemburgo | Luxemburg |
| Luxemburgo en el Festival de la Canción de Eurovisión | Luxembourg in the Eurovision Song Contest |
| luxemburguesa | Luxemburger |
| Luxemburguismo | Luxemburgism |
| luxemburguès | Luxembourgian |
| luxemburgués | Luxemburger |
| Luxor | Luxor |
| Luxón | Luxon |
| luz | whizz |
| Luz característica | Characteristic light |
| luz cenicienta | earthshine |
| Luz colimada | Collimated light |
| luz corta | dipped headlight |
| luz de antorcha | torchlight |
| luz de cruce | dipped headlight |
| luz de Drummond | Drummond light |
| luz de estacionamiento | parking light |
| luz de freno | stoplight |
| luz de gas | gaslight |
| luz de la luna | moonlit |
| luz de las estrellas | starlight |
| luz de luna | moonshine |
| luz de neón | neon light |
| luz de posición | sidelight |
| luz de retroceso | back-up light |
| luz de una lámpara | lamplight |
| luz de una vela | candlelight |
| Luz del cielo nocturno | Airglow |
| luz del día | light |
| luz del fuego | firelight |
| luz del sol | light |
| luz deslumbrante | glare |
| luz fluorescente | neon light |
| luz intermitente | flasher |
| luz lateral | sidelight |
| luz negra | black light |
| luz roja | stoplight |
| Luz silenciosa | Silent Light |
| luz tenue | glimmer |
| luz trasera | taillight |
| luz trémula | shimmer |
| luz verde | green light |
| luz zodiacal | zodiacal light |
