- l ... La Farge, Oliver Hazard Perry
- La Farina, Giuseppe ... La Piedad de Cabadas
- La Place Ducale ... Lab Schools
- lab-on-chip ... labour arbitration
- Labour Code ... Lac Mistassini
- Lac Télé Community Reserve ... lacquer
- lacquer tree ... Laden zum Gutenberg, Johann Gensfleisch zur
- Ladenis, Nico ... Lady of Light
- Lady of Massachusetts, A ... LaFontaine, Sir Louis-Hippolyte, Baronet
- Laforet, Carmen ... Lagrangian equilibrium point
- Lagrangian function ... Laja River
- Laja, Río ... Lake, Simon
- Lake, The ... LAM
- Lam Giang ... Lambert, John
- Lambert, John ... Lamizana, Sangoulé
- Lamlam, Mount ... Lan Xang
- Lan-chou ... land art
- Land Ballot, The ... Lander, Harald
- Lander, John ... Landscape with Christ and the Apostles at the Sea of Tiberias
- Landscape with Het Steen ... Langar, Mount
- Långban ... Language
- language acquisition ... Lantao Island
- Lantau Island ... Laotian language
- laouto ... Laramie
- Laramie Mountains ... Larix
- Larix decidua ... larvas
- Larvenformen der Dipteren ... Lashley, Karl
- Lashley, Karl S. ... Last Encounter, The
- Last Essays of Elia ... Last Theorem, The
- Last Thing He Wanted, The ... Latent Heterosexual, The
- latent image ... Latia neritoides
- Laticauda ... Lattany, Kristin Elaine Hunter
- Lattany, Kristin Hunter ... laughing kookaburra
- Laughing Matter, The ... lauric acid
- Lauricocha ... Laver, Rod
- Laver, Rodney George ... Lawdy Mama
- Lawdy Miss Clawdy ... Lawton
- Lawvere, F. W. ... Lazarsfeld, Paul Felix
- Lazarus ... Le Chiffre
- Le Clézio, Jean-Marie Gustave ... Lea, Tom
- Leabhar Gabhála ... leaf bug
- leaf buttress ... leap second
- Leap Year ... Leballo, Potlako
- Lebanese Civil War ... lechwe
- Lecidea ... Lee
- Lee Byung-Chull ... Leeds
- Leeds ... Legacy of Cain, The
- Legacy of Spies, A ... Legg-Calvé-Perthes syndrome
- Legge, James ... Lehigh Valley Railroad Company
- Lehighton ... Leigh, Vivien
- Leigh-Mallory, Trafford ... lekta
- lekton ... LeMond, Gregory James
- lemongrass ... Lennon, Paul
- Lennon, Sean ... Leo Minor
- Leo onca ... Leonidas II
- Leonidas of Tarentum ... leopon
- Leosthenes ... Leptodactylidae
- Leptodactylinae ... Les Rêveries du promeneur solitaire
- Les Rites de Passage ... lesser frigate bird
- lesser goldfinch ... Let Them Talk
- Let There Be Light ... Lettere familiare
- lettered olive ... Letzeburg
- Letzeburgisch language ... levator scapulae muscle
- leveche ... Levinson, Barry
- Levinson, Daniel J. ... Lewis Glyn Cothi
- Lewis machine gun ... Lex Aquila
- Lex Burgundionum ... LGN
- LH ... Li Nangxiao
- Li Ning ... Liang Ch’i-ch’ao
- Liang Chenyu ... Liber de cultura hortorum
- Liber de fine ... liberalism, classical
- liberalism, theological ... Librairie Larousse
- librarianship ... lichen woodland
- Lichenographia Europaea Reformata ... Liechtenstein
- Liechtenstein, flag of ... Life and Death of Peter Sellers, The
- Life and Labour of the People in London ... Life of Mr. Jonathan Wild the Great, The
- Life of Mrs. Godolphin ... lift-netter
- lift-slab construction ... light range
- light reception ... Ligure, Mar
- Ligures ... Liliuokalani
- Lilius, Aloysius ... Limbe
- limber pine ... Limnichidae
- limning ... Linckia
- Lincoln ... Lindh, John Walker
- Líndhos ... linear graph
- linear induction motor ... lingonberry
- Lingones ... Linnean system
- Linnean taxonomy ... Lion of the Punjab
- Lion of the West, The ... Lippersheim, Hans
- Lippersheim, Jan ... lira
- lira da braccio ... list of astronauts
- list of astronomical observatories and telescopes ... list of directors
- list of doctors of the church ... list of pinnipeds
- list of pirates ... list of true bugs
- list of tunnels ... Literary Magazine, The
- Literary Mongolian ... Lithuania, grand duchy of
- Lithuania, history of ... Little Cripple
- Little Crow ... Little Mo
- Little Monsters ... Little, Royal
- little-leaf linden ... Liu Yuan
- Liu Yüan ... Liverpool
- Liverpool and Manchester Railway ... Livingston, Robert R.
- Livingston, William ... Llandaff Castle
- Llandaff, Cathedral of ... Llull, Ramon
- Llullaillaco, Mount ... lobe-finned fish
- Lobeck, Christian August ... local theory of hunger
- local thunderstorm ... Locofoco Party
- Locomobile ... log
- log ... logical relation
- logical semantics ... Lokamanya
- lokapāla ... Lonardi, Eduardo
- Lonchitidaceae ... London’s Festival Ballet
- London, Artur ... Long Kesh
- Long Kiss Goodnight, The ... long-molecule polymer
- long-nosed bandicoot ... Longhauser, William
- longhead dab ... Longwang
- longwave radiation ... loop pile
- loop scavenging ... Lopholatilus chamaeleonticeps
- Lophomonas ... Lord Strange’s Men
- Lord Weary’s Castle ... Loris tardigradus tardigradus
- Loris, Heinrich ... Loschmidt, Johann Joseph
- Loschmidt, Joseph ... Lothair I
- Lothair II ... Louganis, Gregory Efthimios
- Loughborough ... Louis XIV
- Louis XIV style ... Louvemont, Battle of
- louver ... Love Me Tonight
- Love Medicine ... Lovell, Sir Alfred Charles Bernard
- Lovell, Sir Bernard ... low-centre polygon
- low-cristobalite ... lower limit of detection
- Lower Lorraine ... Loyal Nine
- Loyal Orange Association ... lü pipes
- Lü Pu-wei ... lubricating oil
- lubrication ... Lucidor
- Lucien Leuwen ... Ludd, Harry
- Ludden, Allen ... Luftwaffe
- Lug ... Luisetti, Hank
- Luish language ... Lumière, Louis
- Lumières de Pointe-Noire ... Lunch, the
- Luncheon of the Boating Party ... Luongo, Roberto
- Luoravetlan languages ... Luscinia svecica
- Lushai ... Luton
- Lutosławski, Witold ... Luzhou
- Luzhou ... Lycopersicon pimpinelli folium
- Lycophidion capense ... lymphocytosis
- lymphogranuloma inguinale ... Lyonnet, Pierre
- Lyons ... Lytton, Robert Bulwer-Lytton, 1st earl of
- Lytton, Sir Henry Alfred ... LZW