- Infantile Mortality
- Infantry
- Inflation
- Influenza
- Inge, William Ralph
- Inglis, Elsie Maud
- Ingram, Arthur Foley Winnington
- Inland Water Transport
- Inouye, Kaoru, Marquess
- Insurance
- Intelligence, Military
- Internal Combustion Engines
- International Labour Organization
- International Law
- International Science
- International, The
- Interstate Commerce
- Intestinal Stasis
- Inverforth, Andrew Weir, 1st Baron
- Iowa
- Ireland, John (prelate)
- Ireland, John (composer)
- Ireland
- Irigoyen, Hipólito
- Iron and Steel
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- Irving, Henry Brodribb
- Isostasy
- Israëls, Josef
- Isvolsky, Alexander Petrovich
- Itagaki, Taisuke, Count
- Italian Campaigns
- Italian Literature
- Italo-Turkish War
- Italy
- Jackson, Henry
- Jackson, Sir John
- Jackson, Sir Thomas Graham
- Jacob, Edgar
- Jäger, Gustav
- Jagow, Gottlieb von
- James, Henry
- James of Hereford, Henry James, 1st Baron
- Jameson, Sir Leander Starr
- Janeway, Theodore Caldwell
- Japan
- Jastrow, Morris
- Jaurès, Jean
- Jelf, Sir Arthur Richard
- Jellicoe, John Rushworth Jellicoe, Viscount
- Jellinek, George
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- Jensen, Wilhelm
- Jessopp, Augustus
- Jex-Blake, Sophia
- Jireček, Hermenegild, Ritter von Samakow
- Joffre, Joseph Jacques Césare
- Johannesburg
- John, Augustus Edwyn
- John, Griffith
- Johns Hopkins University
- Johnson, Hiram Warren
- Johnston, Sir Henry Hamilton
- Jones, Emily Elisabeth Constance
- Jones, Henry Arthur
- Jones, Thomas Rupert
- Joseph
- Jutland, Battle of
- Juvenile Employment
- Kahn, Otto Hermann
- Kahr, August Richard von
- Kala-Azar
- Kaledin, Alexei
- Kansas
- Kapp, Wolfgang
- Karolyi, Michael, Count
- Kato, Takaaki Komei, Viscount
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- Katsura, Taro, Prince
- Keane, Augustus Henry
- Keane, John Joseph
- Keary, Charles Francis
- Kellogg, Clara Louise
- Keltie, Sir John Scott
- Kendal, William Hunter
- Kennedy, Sir William Rann
- Kentucky
- Kenya Colony
- Kenyon, Sir Frederic George
- Keogh, Sir Alfref
- Ker, William Paton
- Kératry, Comte Émile de
- Kerensky, Alexander Feodorovich
- Kiamil Pasha
- Kidd, Benjamin
- Kiderlen-Wächter, Alfred von
- Kielmansegg, Erich, Count
- Kiepert, Richard
- King, Leonard William
- Kinnear, Alexander Smith Kinnear, 1st Baron
- Kipling, Rudyard
- Kirk, Sir John
- Kitchener, Horatio Herbert Kitchener, Earl
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