- Jefferson, Charles Edward
- Jefferson, Joseph
- Jefferson, Thomas
- Jelliffe, Smith Ely
- Jesuit Relations and Allied Documents, The
- Jesuits
- Jesup, Morris Ketchum
- Jesup North Pacific Expedition, The
- Jesus, son of Sirach
- Jesus Christ
- Johnson, Andrew
- Johnson, Emily Pauline
- Johnson, Emory Richard
- Johnson, Owen
- Johnson, Robert Underwood
- Johnson, Rossiter
- Johnson, Samuel (college president)
- Johnson, Samuel (man of letters)
- Johnson, Samuel (preacher)
- Johnson, Samuel William
- Johnson, Thomas Loftin
- Johnson, Virginia Wales
- Johnson, William (superindentent-general)
- Juengling, Frederick
- Jug
- Juggernaut
- Juggler
- Juglandacæ
- Jugoslavia
- Juniper
- Junipero, Miguel José Serra
- Junius, Franciscus
- Junius, Letters of
- Junker, Wilhelm
- Junkers
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- Kaiser, Isabelle
- Kaiser
- Kalevala
- Kalevipoeg
- Karpeles, Gustav
- Kearney, Denis
- Keats, John
- Kéler-Béla, Albert Von
- Keleti, Gustav Friedrich
- Keller, Arthur Ignatius
- Keller, Emile
- Keller, Ferdinand
- Keller, Friedrich Ludwig von
- Keller, Gottfried
- Keller, Helen Adams
- Keller, Otto
- Kellerman, William Ashbrook
- Kellermann, Bernhard
- Kellermann, François Chistophe
- Kellermann, François Etienne de
- Kendall, Amos
- Kennedy, Benjamin Hall
- Kennedy, Charles Rann
- Kennedy, Grace
- Kent, Charles Foster
- Keokuk, Moses
- Keppler, Joseph
- Ker, John
- Keratin
- Kerner, Justinius
- Kiderlen-Waechter, Alfred von
- Kidnapped
- Kind, Johann Friedrich
- Kindergarten, The
- Kindi, Abu Yusuf Ya'kub Ibn Ishak Al-
- King, Jonas
- King, Samuel Archer
- Kingsley, James Luce
- Kingwood
- Kinkel, Gottfried
- Kinnicutt, Leonard Parker
- Kino (game)
- Kino (gum)
- Kirchbach, Wolfgang
- Kirchhoff, Charles William Henry
- Kirchhoff, Gustav Robert
- Kirchhoff, Johann Wilhelm Adolf
- Kirchmann, Julius von
- Kirchwey, George Washington
- Kit-Cat Club
- Kit-fox
- Kitchen Cabinet
- Klöden, Karl Friedrich von
- Klonowicz, Sebastian-Fabian
- Klopp, Onno
- Klopstock, Friedrich Gottlieb
- Kloss, Georg Franz Burkhard
- Klostermann, August Heinrich
- Klotz, Christian Adolf
- Klotz, Louis Lucien
- Klotz, Matthias
- Klotz, Reinhold
- Klüber, Johann Ludwig
- Kluck, Alexander H. R. von
- Kluckhohn, August
- Kluge, Friedrich
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- Knabl, Joseph
- Knackfuss, Hermann
- Knapp, Albert
- Knapp, Charles
- Knapp, George Friedrich
- Knapp, Hermann
- Knapp, Martin Augustine
- Knapp, Samuel Lorenzo
- Kneeland, Abner
- Kneeland, Samuel
- Kneipp, Sebestian
- Kneisel, Franz
- Kneller, Sir Godfrey
- Knesebeck, Karl Friedrich von dem
- Kniazhnin, Jakov Borisovich
- Knickerbocker History of New York, The
- Knigge, Adolphus Francis Frederic Louis, Baron de
- Knight, Edward Henry
- Knight, Ellis Cornelia
- Knight, John James
- Knight, Richard Payne
- Knight, Sarah Kemble
- Knight, Thomas Andrew
- Knobelsdorff-Brenkenhoff, Nataly von
- Knortz, Karl
- Knyphausen, Wilhelm von
- Koala
- Kobbé, Gustav
- Kobbé, William August
- Kobé
- Kobell
- Kobell, Ferdinand
- Kobell, Franz
- Kobell, Hendrik
- Kobell, Jan (engraver)
- Kobell, Jan (painter)
- Kobell, Wilhelm von
- Köberle, Georg
- Koberstein, Karl
- Koberstein, Karl August
- Kobo
- Kobold, Hermann Albert
- Kobold
- Koch, Christian Friedrich
- Koch, Joseph Anton
- Koch, Karl
- Koch, Max
- Koch, Robert
- Kochanowski, Jan
- Kocher, Emil Theodor
- Kock, Charles Paul de
- Köckly, Hermann
- Kodak
- Kodama, Gentaro, Viscount
- Kodiak
- Koehler, Robert
- Koel
- Koenigsberger, Leo
- Koester, Frank
- Kohl, Johann Georg
- Kohl-rabi
- Kohler, Josef
- Kohler, Kaufmann
- Köhler, Ulrich
- Köhler, Walther Erich
- Kohlrausch, Friedrich
- Kohlrausch, Rudolf Hermann Arndt
- Kohlsaat, Herman Henry
- Kohn, Salomon
- Koko-nor
- Kootenay River
- Kopisch, August
- Kopitar, Bartholomæus
- Kopp, Georg
- Kopp, Joseph Eutychius
- Köppen, Peter Ivanovitch
- Kordofan
- Kordyan
- Korea
- Korn, Arthur
- Kornemann, Ernst W. G.
- Körner, Christian Gottfried
- Körner, Karl Theodor
- Koszta Affair
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- Kropotkin, Peter Alexeievitch
- Krout, Mary Hannah
- Kürschner, Joseph
- La Follette, Robert Marion
- La Fontaine, Jean de
- La Fontaine, Louis Hippolyte
- La Fontaine Fables
- Lafontaine, August Heinrich Julius
- Lafontaine, Henri
- Lafuente y Zamalloa, Modesto
- Lagarde, Paul Anton
- Lagarto
- Lagerlof, Ottilia Lovisa Selma
- Lake Dwellings
- Lake Forest
- Lake Forest University
- Lamb, Martha Joan Reade Nash
- Lamprecht, Karl
- Lamprecht the Priest
- Lancaster (Massachusetts)
- Land-Bridges Across the Oceans
- Land Crabs
- Langbein, August Friedrich Ernst
- Lanier, Sidney
- Laocoön
- Laodamia
- Laokoon
- Last of the Mohicans, The
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