- Klinger, Max
- Kluck, Alexander von
- Knights of Columbus
- Knox, Philander Chase
- Knox-Little, William John
- Kolchak, Vladimir Vasilievich
- Komura, Jutaro, Marquess
- Korbay, Francis
- Körber, Ernst, Ritter von
- Korea
- Kornilov, Lavr Georgievich
- Kossuth, Francis
- Kövess, Hermann, Freiherr von Kövesshaza
- Krobatin, Alexander, Freiherr von
- Kropotkin, Peter Alexeivich, Prince
- Krümmel, Otto
- Kühlmann, Richard von
- Külpe, Oswald
- Kun, Bela
- Kuprin, Alexander Ivanovich
- Kurdistan
- Kuropatkin, Alexei
- Kusmanek von Burgneustätten, Hermann
- Kuyper, Abraham
- Labori, Fernand
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- Labouchere, Henry du Pré
- Labor, Department of
- Labour Legislation
- Labour Ministry and Department of Labour
- Labour Supply and Regulation
- Labrador
- Ladenburg, Albert
- La Follette, Robert Marion
- Lagerlöf, Selma
- Lagos
- Laguerre, Jean Henri Georges
- Laisant, Charles Anne
- Laking, Sir Francis Henry
- Lammasch, Heinrich
- Lamont, Thomas William
- Lanciani, Rodolfo
- Lane, Franklin Knight
- Lane, Sir Hugh Percy
- Lanessan, Jean Marie Antoine de
- Lang, Andrew
- Lang, Cosmo Gordon
- Langle de Cary, Fernand Louis Armand Marie de
- Langlois, Hippolyte
- Lankester, Sir Edwin Ray
- Lanrezac, Charles Louis
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- Lansbury, George
- Lansdowne, Henry Charles Keith Petty Fitzmaurice, 5th Marquess of
- Lansing, Robert
- Lapworth, Charles
- Lascelles, Sir Frank Cavendish
- Latvia
- Lauder, Sir Harry Maclennan
- Laughton, Sir John Knox
- Laurance, Sir John Compton
- Laurier, Sir Wilfrid
- Lavery, Sir John
- Law, Andrew Bonar
- Lawes-Wittewronge, Sir Charles Bennet
- Lawless, Emily
- Lawrence, Thomas Edward
- League of Nations
- Leather
- Lecocq, Alexandre Charles
- Lee, Sir Sidney
- Lee, Vernon
- Legros, Alphonse
- Lehmann, Liza
- Leland Stanford Jr. University
- Lemaître, François Élie Jules
- Leman, Gérard Joseph Mathieu Georges
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- Lemberg, Battles round
- Lemonnier, Antoine Louis Camille
- Lenin, Vladimir Ilich
- Leoncavallo, Ruggiero
- Leroy-Beaulieu, Henri Jean Baptiste Anatole
- Leroy-Beaulieu, Pierre Paul
- Leschetizsky, Theodor
- Lethaby, William Richard
- Lettow-Vorbeck, Paul von
- Levasseur, Pierre Émile
- Leverhulme, William Hesketh Lever, 1st Baron
- Levy, Auguste Michel
- Lewis, Sir George Henry
- Lewis, Isaac Newton
- Lewkowitsch, Julius
- Liberia
- Liberty, Sir Arthur Lasenby
- Liberty Loan Publicity Campaigns
- Lichnowsky, Prince Karl Max von
- Liebknecht, Karl
- Liége
- Liggett, Hunter
- Lighting, Electric
- Light Railways, Military
- Lilly, William Samuel
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