| lekkomyślność | carelessness |
| lekkomyślny | thoughtless |
| lekkostrawny | light |
| leksem | lexeme |
| Lekser | Lexical analysis |
| Leksowizaur | Lexovisaurus |
| leksyka | vocabulary |
| Leksykologia | Lexicology |
| leksykon | lexicon |
| lektor | announcer |
| lektorat | foreign language course |
| Lektorium | Chancel screen |
| lektyka | litter |
| Lekyt | Lekythos |
| Lekárovce | Lekárovce |
| lelek kozodój | nightjar |
| Leliwa | Leliwa coat of arms |
| Lelkowe | Caprimulgiformes |
| Lelydorp | Lelydorp |
| Lelystad | Lelystad |
| Lem | LEM |
| Lemat o pompowaniu dla języków bezkontekstowych | Pumping lemma |
| Lemat Poincarégo | Closed and exact differential forms |
| Lematy Borela-Cantellego | Borel-Cantelli lemma |
| Lembata | Lembata |
| Lemegeton | The Lesser Key of Solomon |
| Lemgo | Lemgo |
| lemiesz | blade |
| leming | lemming |
| Lemmy Kilmister | Lemmy |
| Lemniskata | Lemniscate |
| Lemniskata Bernoullego | Lemniscate of Bernoulli |
| Lemniskata Bernoulliego | Lemniscate of Bernoulli |
| Lemniskata Bootha | Lemniscate of Booth |
| Lemnos | Lemnos |
| lemoniada | lemonade |
| Lemony Snicket | Lemony Snicket |
| Lempa | Lempa River |
| Lempira | Honduran lempira |
| lemur | lemur |
| Lemur karłowaty | Hairy-eared Dwarf Lemur |
| Lemur wari | Black-and-white Ruffed Lemur |
| Lemur zwany Rollo | Fierce Creatures |
| Lemuralia | Lemuria |
| Lemurek myszaty | Gray Mouse Lemur |
| Lemuria | Lemuria |
| Lemurki | Cheirogaleidae |
| Lemurkowate | Cheirogaleidae |
| Lemury | Lemuridae |
| len | flax |
| Len przeczyszczający | Linum catharticum |
| Len trwały | Linum perenne |
| Lena | Lena River |
| Lena Katina | Lena Katina |
| Lendler | Ländler |
| Lengdorf | Lengdorf |
| Lengenwang | Lengenwang |
| Lenggries | Lenggries |
| Leni Riefenstahl | Leni Riefenstahl |
| Leningrad | Leningrad |
| lenistwo | laziness |
| leniuch | saunter |
| leniwiec | sloth |
| Leniwiec grzywiasty | Maned Three-toed Sloth |
| Leniwiec pstry | Brown-throated Three-toed Sloth |
| Leniwiec trójpalczasty | Pale-throated Three-toed Sloth |
| leniwieć | get lazy |
| leniwy | lazy |
| Lenińsk Kuźniecki | Leninsk-Kuznetsky |
| Lenkoran | Lankaran |
| Lenna | Lenna |
| Lennart Bernadotte | Count Lennart Bernadotte of Wisborg |
| Lennart Carleson | Lennart Carleson |
| Lennart Johansson | Lennart Johansson |
| Lennart Meri | Lennart Meri |
| Lennart Torstensson | Lennart Torstenson |
| Lenningen | Lenningen |
| Lennox Lewis | Lennox Lewis |
| Lenny Kravitz | Lenny Kravitz |
| Lenovo | Lenovo Group |
| Lenting | Lenting |
| Lentini | Lentini |
| Lentiwirusy | Lentivirus |
| Lenvik | Lenvik |
| Lenzkirch | Lenzkirch |
| Leo Allatius | Leo Allatius |
| Leo Amery | Leo Amery |
| Leo Beenhakker | Leo Beenhakker |
| Leo Esaki | Leo Esaki |
| Leo Franco | Leo Franco |
| Leo Hendrik Baekeland | Leo Baekeland |
| Leo Kereselidze | Leo Kereselidze |
| Leo Scheffczyk | Leo Scheffczyk |
| Leo von Caprivi | Leo von Caprivi |
| Leo von Klenze | Leo von Klenze |
| Leoben | Leoben |
| Leon | Leon |
| Leon Billewicz | Leon Billewicz |
| Leon Bloy | Léon Bloy |
| Leon Cooper | Leon Cooper |
| Leon Dehon | Leon Dehon |
| Leon Festinger | Leon Festinger |
| Leon I | Leo I |
| Leon II | Leo II |
| Leon III | Leo III |
| Leon III Izauryjczyk | Leo III the Isaurian |
| Leon IV Chazar | Leo IV the Khazar |
| Leon IX | Pope Leo IX |
| Leon Jessel | Leon Jessel |
| Leon Lemke | Lev Lemke |
| Leon Marchlewski | Leon Marchlewski |
| Leon Modena | Leon of Modena |
| Leon Pinsker | Leon Pinsker |
| Leon Rupnik | Leon Rupnik |
| Leon Schlumpf | Leon Schlumpf |
| Leon V Armeńczyk | Leo V the Armenian |
| Leon VI Filozof | Leo VI the Wise |
| Leon VII | Pope Leo VII |
| Leon VIII | Pope Leo VIII |
| Leon Wasilewski | Leon Wasilewski |
| Leon X | Pope Leo X |
| Leon XI | Pope Leo XI |
| Leon XII | Pope Leo XII |
| Leon zawodowiec | Léon |
| Leon-Etienne Duval | Léon-Etienne Duval |
| Leona | Leona |
| Leonard | Leonard |
| Leonard Adleman | Leonard Adleman |
| Leonard Bernstein | Leonard Bernstein |
| Leonard Bloomfield | Leonard Bloomfield |
| Leonard Cohen | Leonard Cohen |
| Leonard McCoy | Leonard McCoy |
| Leonard Nimoy | Leonard Nimoy |
| Leonard Orban | Leonard Orban |
| Leonard Peltier | Leonard Peltier |
| Leonard Woolf | Leonard Woolf |
| Leonard Woolley | Leonard Woolley |
| Leonard z Limoges | Leonard of Noblac |
| Leonard z Porto Maurizio | Leonard of Port Maurice |
| Leonard z Quirmu | Leonard of Quirm |
| Leonardo | Leonardo |
| Leonardo Bruni | Leonardo Bruni |
| Leonardo da Vinci | Leonardo da Vinci |
| Leonardo di Bona | Giovanni Leonardo Di Bona |
| Leonardo DiCaprio | Leonardo DiCaprio |
| Leonardo Loredano | Leonardo Loredan |
| Leonardo Rodriguez | Leonardo Rodríguez |
| Leonardo Sandri | Leonardo Sandri |
| Leonardo Torres y Quevedo | Leonardo Torres y Quevedo |
| Leonberg | Leonberg |
| Leonberger | Leonberger |
| Leoncjusz II | Leontios |
| Leonding | Leonding |
| Leone | Sierra Leonean leone |
| Leone Battista Alberti | Leone Battista Alberti |
| Leonel Fernández | Leonel Fernández |
| Leonel Sánchez | Leonel Sánchez |
| Leonhard Euler | Leonhard Euler |
| Leonhard Stock | Leonhard Stock |
| Leonhart Fuchs | Leonhart Fuchs |
| Leonid | Leonidas |
| Leonid Andrejew | Leonid Andreyev |
| Leonid Breżniew | Leonid Brezhnev |
| Leonid Burjak | Leonid Buryak |
| Leonid Goworow | Leonid Govorov |
| Leonid Hurwicz | Leonid Hurwicz |
| Leonid Judasin | Leonid Yudasin |
| Leonid Kizim | Leonid Kizim |
| Leonid Krawczuk | Leonid Kravchuk |
| Leonid Kuczma | Leonid Kuchma |
| Leonid Mandelstam | Leonid Isaakovich Mandelstam |
| Leonid Popow | Leonid Popov |
| Leonid Sołowjow | Leonid Solovyov |
| Leonid Stadnik | Leonid Stadnyk |
| Leonid Stein | Leonid Stein |
| Leonid Szebarszyn | Leonid Shebarshin |
| Leonidas | Leonidas |
| Leonidas I | Leonidas I |
| Leonidy | Leonids |
| Leoninus | Léonin |
| Leonor Varela | Leonor Varela |
| Leontij Benois | Leon Benois |
| Leonty Andrianowicz Gagemeister | Leonty Andrianovich Gagemeister |
| Leopold | Leopold |
| Leopold Godowski | Leopold Godowsky |
| Leopold I | Leopold I |
| Leopold I Koburg | Leopold I of Belgium |
| Leopold II | Leopold II |
| Leopold II Koburg | Leopold II of Belgium |
| Leopold III | Leopold III |
| Leopold III Koburg | Leopold III of Belgium |
| Leopold Infeld | Leopold Infeld |
| Leopold Kronecker | Leopold Kronecker |
| Leopold Mozart | Leopold Mozart |
| Leopold Okulicki | Leopold Okulicki |
| Leopold Ružička | Lavoslav Ružička |
| Leopold Sacher Masoch | Leopold von Sacher-Masoch |
| Leopold Staff | Leopold Staff |
| Leopold Stokowski | Leopold Stokowski |
| Leopold Trepper | Leopold Trepper |
| Leopold von Buch | Christian Leopold von Buch |
| Leopold von Daun | Leopold Josef Graf Daun |
| Leopold von Ranke | Leopold von Ranke |
| Leopold von Sacher-Masoch | Leopold von Sacher-Masoch |
| Leopold Wilhelm Habsburg | Archduke Leopold Wilhelm of Austria |
| Leopold Zund | Leopold Zunz |
| Leopoldo Luque | Leopoldo Luque |
| Leopoldov | Leopoldov |
| Leopoldstadt | Leopoldstadt |
| Leopoldyna Teresa Bragança | Princess Leopoldina of Brazil |
| Leotychidas II | Leotychidas |
| Leowigild | Liuvigild |
| Leoš Janáček | Leoš Janáček |
| lepa | snow slush |
| Lepczowie | Lepcha people |
| Lepel | Lepiel |
| Lepidochelys | Ridley sea turtle |
| Lepidofity | Lepidodendron |
| Lepidozaury | Lepidosauria |
| lepiej | better |
| lepiej późno niż wcale | better late than never |
| Lepiă | Affix |
