- Grinnell, Josiah Bushnell
- Griswold, Stanley
- Groesbeck, William Slocum
- Gross, John Daniel
- Gross, Samuel David
- Gross, William Hickley
- Grover, Cuvier
- Grover, Lafayette
- Grow, Galusha Aaron
- Guernsey, Alfred Hudson
- Gundlach, Juan
- Gurowski, Adam
- Gustafson, Axel Carl Johan
- Gutheim, James Koppel
- Guthers, Karl
- Haddock, Charles Brickett
- Haddock, John A.
- Hadley, James
- Haenke, Thaddeus
- Haga, Godfrey
- Hagen, Hermann August
- Hagen, Theodore
- Hager, Albert David
- Hager, John Sharpenstien
- Hagert, Henry Schell
- Hagner, Peter
- Hagood, Johnson
- Hague, William
- Hahn, Michael
- Haidt, John Valentine
- Haldeman, Samuel Stehman
- Hale, Benjamin
- Hale, Eugene
- Hale, John
- Hale, John Parker
- Hallam, William
- Halleck, Fitz-Greene
- Halstead, Murat
- Hamilton, Andrew (lawyer)
- Hamilton, Andrew (governor)
- Hammond, Charles
- Harbaugh, Henry
- Harding, Chester
- Harmand, Louis Gustave
- Harmar, Josiah
- Harper, James
- Harrington, Timothy
- Harris, Joel Chandler
- Harris, John
- Harris, William Torrey
- Harrison, Benjamin
- Harrison, Sarah
- Hart, Abraham
- Hart, Charles Henry
- Hartt, Charles Frederick
- Hartwell, Alonzo
- Hartwick, John Christopher
- Harvard, John
- Haskell, Abraham
- Hassaurek, Friedrich
- Hassler, Ferdinand Rudolph
- Hassler, Simon
- Hatuey
- Hauck, Minnie
- Haughery, Margaret
- Haun, Henry P.
- Haupt, Herman
- Haupt, Paul
- Haveland, Laura Smith
- Havemeyer, William Frederick
- Haven, Alice Bradley
- Hawley, Joseph Roswell
- Hawley, William Merrill
- Hawthorne, Nathaniel
- Hay, John
- Hayes, Rutherford Birchard
- Haygood, Atticus Green
- Hayman, Samuel Brinkle
- Hayne, Isaac
- Haynes, Henry Williamson
- Haynes, John
- Hays, Alexander
- Hayward, James
- Hazewell, Charles Creighton
- Heck, Barbara
- Hecker, Friedrich Karl Franz
- Hecker, Isaac Thomas
- Heckewelder, John Gottlieb Ernestus
- Hedge, Levi
- Heflin, Robert Stell
- Heg, Hans C.
- Hehl, Matthew
- Heilprin, Phineas Mendel
- Heilprin, Phineas Michael
- Heintzelman, Samuel Peter
- Heiss, Michael
- Heister, Leopold Philip de
- Heitzman, Charles
- Helfenstein, John Conrad Albert
- Helias d'Humonde, Ferdinand Mary
- Hellmuth, Isaac
- Helm, Israel
- Helm, John Larue
- Helmuth, Justus Christian Henry
- Hempel, Charles Julius
- Henck, John Benjamin
- Hendee, Mrs.
- Hendel, William
- Hendrick
- Henrion, Nicolas
- Hensler, Eliza
- Henson, Josiah
- Henson, Poindexter Smith
- Hentz, Nicholas Marcellus
- Herauld, André
- Herbette, André Paul
- Hering, Constantin
- Herkimer, Nicholas
- Herman, John Gottlieb
- Hermstaedt, Nicholas Piet
- Hernandez, Francisco
- Hernandez, Vicente
- Herndon, William Lewis
- Herrera, Miguel da Fonseca e Silva
- Herring, James
- Herrman, Augustine
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- Hidalgo y Costilla, Miguel
- Hiester, Daniel
- Higbee, Elnathan Elisha
- Higginson, Francis
- Higginson, Stephen
- Higuaihué
- Hildreth, Samuel Prescott
- Hilgard, Theodore Erasmus
- Hillard, George Stillman
- Hillegas, Michael
- Hilprecht, Hermann Vollrat
- Hinrichs, Gustavus Detlef
- Hirsch, Samuel
- Hirst, Henry Beck
- Hitchcock, Alfred
- Hitchcock, Peter
- Hjorn, Oscar
- Hoadley, George
- Hoar, Jonathan
- Hoar, Leonard
- Hoar, Samuel
- Hoe, Robert
- Hoecken, Christian
- Hoey, Josephine
- Hoff, Henry Kuhn
- Hoffman, Beekman Verplanck
- Holden, Oliver
- Hole-in-the-Day
- Holland, Frederick West
- Holloway, Laura Carter
- Holls, George Charles
- Holly, James Theodore Augustus
- Holm, John Campanius
- Holst, Hermann Eduard von
- Holstein, La Fayette Villaume
- Hooker, Isabella Beecher
- Hooker, Joseph
- Hooker, Thomas
- Hopkins, Samuel (theologian)
- Horn, Van de
- Horne, Antoine
- Hosmer, George Washington
- Hosmer, Harriet
- Hosmer, Jean
- Hosmer, Margaret
- Hosmer, Titus
- Houdetot, François Lauriot de
- Howard, Oliver Otis
- Howe, Elias
- Howe, Henry
- Howe, John Ireland
- Howe, Samuel Gridley
- Howells, William Dean
- Huden, Lucas Van
- Hudson, Charles
- Hudson, Erasmus Darwin
- Hudson, Frederic
- Hudson, Henry
- Huebner, John Andrew
- Huebsch, Adolph
- Huebschmann, Francis
- Hueffel, Christian Gottlieb
- Huehuetemixcatl
- Huelen
- Huet de Navarre
- Hughes, Ball
- Hühne, Bernhard
- Huitzilihuitl
- Huitzilihuitzin
- Huitziton
- Hulett, Alta M.
- Humming-bird
- Humphrey, Elizabeth B.
- Humphrey, Heman
- Humphrey, Herman Loin
- Humphrey, James
- Huntington, Elisha Mills
- Huntington, Frederick Dan
- Huntington, Jabez
- Huntington, Lucius Seth
- Huntington, Samuel
- Hurd, Frank Hunt
- Hurlbut, Stephen Augustus
- Huss, Magnus
- Hutchins, Thomas
- Hutten, Philip von
- Ietersdorf-Klasten, Gustav von
- Iff, Simon van
. . .
- Ingalls, John James
- Ingalls, Rufus
- Ingalls, William
- Inge, Samuel W
- Ingenhous, Jean Simon
- Imlay, Gilbert
- Inama, Francis
- Indarte, José Rivera
- Infante, Hermenegildo
- Infante, José Miguel
. . .
- Ingersoll, Ernest
- Ingersoll, Jared
- Irvin, William W.
- Iselin, Jacob Christian
- Ixtlilcuechahua
- Ixtlilxochitl I.
- Ixtlilxochitl II.
- Ixtlilxochitl, Fernando de Alba
- Izcohuatl
- Jacintha do San José
- Jacker, Edward
- Jackson, Abner
- Jackson, Andrew
- Jackson, Jonathan
- Jacobi, Abraham
- Jacobs, Sarah Sprague
- Jacobsen, Simon
- Jacobson, Christian
- Jacobson, John Christian
- Jacobus, Melanchthon Williams
- Jacoby, Ludwig Sigismund
- Jacome, Diego
- Jarvis, Edward
- Jasper, William
- Jaureybo I.
- Jaureybo II.
- Jay, John
- Jefferson, Joseph
- Jefferson, Thomas
- Johnson, Eastman
- Johnson, Rossiter
- Johnston, John (Indian agent)
- Joy, Charles Arad
- Judson, Adoniram
- Judson, Andrew Thompson
- Judson, Edward Z. C.
- Juels, Niels
- Juengling, Frederick
- Jügler, Lorenz
- Julian, George Washington
- Julien, Alexis Anastay
- Julio, E. B. D. Fabrino
- Jumel, Eliza Bowen
- Jungmann, Bernhardt
- Jungmann, John George
- Junipero, Miguel José Serra
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- Kalakaua, David
- Kalb, Johann de
- Kalbfleisch, Martin
- Kaler, James Otis
- Kalisch, Isidor
- Kalm, Peter
- Kalopothakes, Martha Hooper Blackler
- Kane, Paul
- Kannegieser, Sigismund
- Kapp, Friedrich
- Kaufman, Theodore
- Kautz, August Valentine
- Kearny, Lawrence
- Keese, John
- Kehr, Gustav Herman
- Kelpius, John
- Kemble, Charles
- Kemble, Gouverneur
- Kemeys, Edward
- Kendrick, Clark
- Kenna, John Edward
- Keokuk
- Kerr, Joseph
- Key, Philip Barton
- Key, Thomas Marshall
- Keyes, Emerson Willard
- Keyes, Erasmus Darwin
- Keyl, Ernst Gerhard Wilhelm
- Keyser, Ephraim
- Keyser, Peter Dirck
- Kidd, William
- Kiddle, Henry
- Kiderlen, William Ludwig Joseph
- Kidwell, Zedekiah
- Kiefer, Herman
- King, Jonas
- King, Samuel Archer
- Kingsley, James Luce
- Kinloch, Francis
- Kinloch, Robert Alexander
- Kinne, Aaron
- Kinnersley, Ebenezer
- Kinney, Coates
- Kinney, John Fitch
- Kinney, Jonathan Kendrick
- Kinney, William Burnet
- Kinnison, David
- Kirchhoff, Charles William Henry
- Kislingbury, Frederick Foster
- Kittredge, Thomas
- Kjoeping, Oläus
- Kleeberg, Minna
- Klein, Gustav Frederic
- Klingsohr, John Augustus
- Klüber, Melchior
- Knapp, Francis
- Knapp, Jacob
- Knapp, Jacob Hermann
- Knapp, Mathias
- Knapp, Samuel Lorenzo
- Kneass, Strickland
- Kneeland, Abner
- Kneeland, Samuel (printer)
- Kneeland, Samuel (naturalist)
- Knight, Edward Henry
- Knight, Sarah
- Knortz, Karl
- Knox, Hugh
- Knox, James
- Knox, John
- Knox, John J.
- Knox, Samuel Richardson
- Knox, Thomas Wallace
- Knyphausen, Wilhelm von
- Koehler, Alexander Daniel
- Koehler, John Daniel
- Koehler, Robert
- Koehler, Sylvester Rosa
- Koenig, George Augustus
- Koenig, Juan Ramon
- Koeppen, Adolphus Louis
- Koerner, Gustav
- Kohl, John George
- Kosciuszko, Tadeusz
- Kountz, John S.
- Krackowizer, Ernest
- Kraitsir, Charles
- Krautbauer, Francis Xavier
- Krauth, Charles Philip
- Krebs, John Michael
- Krehbiel, Henry Edward
- Krimmel, John Lewis
- Kroeger, Adolph Ernst
- Krogstrupp, Otto Christian
- Krohn, Joseph Hyacinthe
- Krotel, Gottlob Frederick
- Krummacher, Friedrich Wilhelm
- Krusenstern, Adam Johann von
- Kryn
- Kuhn, Adam
- Kühn, Eusebius Francis
- Kunkel, John Christian
- Kunth, Charles Sigismund
- Kuntze, Edward J.
- Kunz, George Frederick
- Kunze, John Christopher
- Kunze, Richard Ernest
- Kurtz, John D.
- Kurtz, John Nicholas
- Kuypers, Warmuldus
- Kyan, John H.
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- La Pérouse, Jean François de Galaup
- La Salle, Robert Cavelier, Sieur de
- Las Casas, Gonzalo
- Lathrop, Francis
- Laudonnière, René de
- Launitz, Robert Eberhard
- Laurent, Cornelius Baldran
- Lawrence, Amos
- Le Clear, Thomas
- Lederer, John
- Ledyard, William
- Lee, Ann
- Lee, Charles
- Leisler, Jacob
- Lenox, James
- Lesley, Peter
- Leslie, Alexander
- Leslie, Eliza
- Leslie, Frank
- Leutze, Emanuel
- Le Van, William Barnet
- Le Vert, Octavia Walton
- Lewis, Estelle Anna Blanche Robinson
- Leypoldt, Frederick
- Lieber, Francis
- Lincoln, John Larkin
- Lincoln, Levi
- Lincoyan
- Linderman, Henry Richard
- Lind-Goldschmidt, Jenny
- List, Friedrich
- Littell, Eliakim
- Little, Charles Coffin
- Little, Sophia Louise
- Little Crow
- Little Turtle
- Lobeck, Justus Florian
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