| LSD | Acid |
| Luanda | Luanda |
| Lublin | Lublin |
| Luc Besson | Luc Besson |
| Luca Pacioli | Luca Pacioli |
| Luca Signorelli | Luca Signorelli |
| Luca Toni | Luca Toni |
| Lucas Black | Lucas Black |
| Lucas Caca de Deus Santos | Lucas de Deus Santos |
| Lucas David | Lucas David |
| Lucas Jacobsøn Debes | Lucas Debes |
| Lucas-Lehmer | Lucas-Lehmer test for Mersenne numbers |
| Lucca | Lucca |
| Luchino Visconti | Luchino Visconti |
| Lucia | Lucy |
| Luciano Berio | Luciano Berio |
| Luciano Floridi | Luciano Floridi |
| Luciano Pavarotti | Luciano Pavarotti |
| Lucide drømme | Lucid dream |
| Lucien Van Impe | Lucien Van Impe |
| Lucifer | Lucifer |
| Lucius Aelius Sejanus | Sejanus |
| Lucius Annaeus Seneca | Seneca the Younger |
| Lucius Antonius Saturninus | Lucius Antonius Saturninus |
| Lucius Appulejus Saturninus | Lucius Appuleius Saturninus |
| Lucius Cornelius Cinna | Lucius Cornelius Cinna |
| Lucius Cornelius Sulla | Lucius Cornelius Sulla |
| Lucius Sergius Catilina | Catiline |
| Lucky Luke | Lucky Luke |
| Lucretia | Lucretia |
| Lucretias Voldførelse | The Rape of Lucretia |
| Lucrezia Borgia | Lucrezia Borgia |
| Lucy | Australopithecus afarensis |
| Lucy Maud Montgomery | Lucy Maud Montgomery |
| lud | lye |
| Ludacris | Ludacris |
| luder | whore |
| Ludomani | Problem gambling |
| Ludovico Sforza | Ludovico Sforza |
| Ludvig den Fromme | Louis the Pious |
| Ludvig den Hellige | Louis IX of France |
| Ludvig den Stammende | Louis the Stammerer |
| Ludvig Lorenz | Ludvig Lorenz |
| Ludvig-Filip af Frankrig | Louis-Philippe of France |
| Ludwig Achim von Arnim | Ludwig Achim von Arnim |
| Ludwig Beck | Ludwig Beck |
| Ludwig Erhard | Ludwig Erhard |
| Ludwig Feuerbach | Ludwig Andreas Feuerbach |
| Ludwig Mies van der Rohe | Ludwig Mies van der Rohe |
| Ludwig Otto Hesse | Otto Hesse |
| Ludwig Senfl | Ludwig Senfl |
| Ludwig van Beethoven | Ludwig van Beethoven |
| Ludwig von Köchel | Ludwig Ritter von Köchel |
| Ludwig von Mises | Ludwig von Mises |
| Ludwig Wittgenstein | Ludwig Wittgenstein |
| Ludwigsburg | Ludwigsburg |
| Ludwigshafen am Rhein | Ludwigshafen am Rhein |
| Ludzas distrikt | Ludza District |
| lue | flame |
| luft | air |
| luft-vand vekselvirkning | air-water interaction |
| luftangreb | air raid |
| luftbase | airbase |
| Luftbombardementet af Dresden | Bombing of Dresden in World War II |
| luftbåren støj | airborne noise |
| Lufte | Give an airing |
| Luftens Helte | TaleSpin |
| luftfart | air transportation |
| luftfartslovgivning | air traffic law |
| luftfartssikkerhed | air safety |
| Luftfartøj | Aircraft |
| luftforurenende gas | gaseous air pollutant |
| luftforurenende stof | air pollutant |
| luftforurenende stoffers udvikling | pollutant evolution |
| luftforurening | air pollution |
| luftfoto | aerial photograph |
| luftfotografering | aerial photography |
| Luftfugtighed | Humidity |
| Lufthansa | Lufthansa |
| lufthavn | airport |
| Luftig | Well-ventilated |
| luftkastel | castle in the air |
| luftkonditioneret | air-conditioned |
| luftkonditionering | air-conditioning |
| luftkvalitet | air quality |
| luftkvalitetskontrol | air quality control |
| luftledning | overhead power line |
| luftmodstand | air resistance |
| luftning | aeration |
| luftpost | airmail |
| Luftpumpen | Antlia |
| Luftrensende planter | List of air-filtering plants |
| luftrum uden forurening | clean air area |
| Luftrumsklasse | Airspace class |
| luftrumsplanlægning | airspace planning |
| luftskib | dirigible |
| Luftskibet Italia | Airship Italia |
| Luftslaget om England | Battle of Britain |
| luftstrøm | wind |
| luftstyrke | air force |
| Lufttankning | Aerial refueling |
| lufttemperatur | air temperature |
| lufttrafik | air traffic |
| lufttransport | air movement |
| lufttæt | airtight |
| luftvejslidelse | respiratory disease |
| Luftvåben | Air force |
| Luftwaffe | Luftwaffe |
| Lugano | Lugano |
| luge | trapdoor |
| Luggude Herred | Luggude Hundred |
| lugt | smell |
| Luigi Boccherini | Luigi Boccherini |
| Luigi Cherubini | Luigi Cherubini |
| Luigi Galvani | Luigi Galvani |
| Luigi Pirandello | Luigi Pirandello |
| Luis Buñuel | Luis Buñuel |
| Luis Felipe Laverde | Luis Felipe Laverde |
| Luis Garcia | Luis Javier García Sanz |
| Luis Herrera | Luis Herrera |
| Luis León Sánchez | Luis León Sánchez |
| Luis Pérez | Luis Pérez |
| Luis Suárez | Luis Suárez |
| Luis Vaz de Camões | Luís de Camões |
| Luisa Miller | Luisa Miller |
| Luiz Inácio Lula da Silva | Luiz Inácio Lula da Silva |
| Lukas | Luke the Evangelist |
| Lukas Moodysson | Lukas Moodysson |
| Lukas Podolski | Lukas Podolski |
| Lukasevangeliet | Gospel of Luke |
| Luke Skywalker | Luke Skywalker |
| Lukian | Lucian |
| lukke | close |
| lukke op | open |
| Lukke op for | Fire |
| Lukker | Cup-leather |
| Lukrets | Lucretius |
| Luleå | Luleå |
| Lumen | Lumen |
| Lumen Gentium | Lumen Gentium |
| Luminescens | Luminescence |
| lummer | sultry |
| lun | warm |
| Luna Lovegood | Luna Lovegood |
| Luna-programmet | Luna programme |
| Lunar Orbiter-programmet | Lunar Orbiter program |
| LunarStorm | LunarStorm |
| lunch | lunch |
| Lund | Lund |
| Lund Domkirke | Lund Cathedral |
| Lund Stift | Diocese of Lund |
| Lund Universitet | Lund University |
| Lunda | Lunda language |
| Lunderskov Kommune | Lunderskov municipality |
| Lunds kommun | Lund |
| lunefuld | fickle |
| lunge | lung |
| Lungebetændelse | Pneumonia |
| Lungefisk | Lungfish |
| Lungekræft | Lung cancer |
| lungesygdom | pulmonary disease |
| lunken | lukewarm |
| Lunner | Lunner |
| Lunningprisen | Lunning Prize |
| Lupang Hinirang | Lupang Hinirang |
| Lupercalegrotten | Lupercal |
| Lupercalia | Lupercalia |
| Lupus Thunder | Lüpüs Thünder |
| Luristan | Lorestān Province |
| Lurøy | Lurøy |
| lus | louse |
| Lusaka | Lusaka |
| Lusitania | Lusitania |
| Lussekatt | Saffron bun |
| Lut | Lute |
| lutetium | lutetium |
| Luther | Luther |
| Lutheranisme | Lutheranism |
| Luthersk ortodoksi | Lutheran Orthodoxy |
| Luton | Luton |
| Luton Airport | London Luton Airport |
| Lutsk | Lutsk |
| lutter øre | all ears |
| luv | weather |
| luvart | windward |
| Luvisk | Luwian language |
| luvside | windward |
| lux | lux |
| Luxembourg | Luxembourg |
| luxembourgsk | Luxembourgian |
| Luxor | Luxor |
| Luzern | Lucerne |
| Luzon | Luzon |
| Luís Enrique Martínez García | Luis Enrique Martínez García |
| Luís Figo | Luís Figo |
| Lviv | Lviv |
| Lycopodiophyta | Lycopodiophyta |
| lyd | sound |
| Lydbånd | Tape |
| lydbølge | sound wave |
| lyddæmper | silencer |
| lydens hastighed | speed of sound |
| Lydien | Lydia |
| Lydisk | Lydian mode |
| lydisolation | acoustic insulation |
| lydkort | sound card |
| lydmåling | sound measurement |
| lydpotte | silencer |
| Lykien | Lycia |
| Lykisk | Lycian language |
| lykke | joy |
| Lykkehjulet | Wheel of Fortune |
| lykkelig | happy |
| Lykkepille | Selective serotonin reuptake inhibitor |
