Howard—Hyde
- Howard, Edward Lloyd
- Howard, Henry
- Howard, Richard H. L.
- Howard, Robert Palmer
- Howard, William Lee
- Howard, William Travis
- Howe, Elliot C.
- Howe, Samuel Gridley
- Howe, Zadok
- Hoy, Philo Romayne
- Hoyt, Frank Crampton
- Hubbard, John
- Hubbard, Oliver Payson
- Hubbard, Thomas
- Hubbell, Alvin Allace
- Hudson, Erasmus Darwin (1805–1880)
- Hudson, Erasmus Darwin (1843–1887), see Hudson, Erasmus Darwin (1805–1880)
- Huger, Francis Kinlock
- Hughes, Charles Hamilton
- Hullihen, Simon P.
- Hun, Edward Reynolds
- Hun, Thomas
- Hunt, Ebenezer Kingsbury
- Hunt, Ezra Mundy
- Hunt, Harriot Kezia
- Hunt, Henry Hastings
- Hunt, John Gibbons
- Hunt, Thomas
- Hunt, William
- Hunter, William
- Huntington, David Low
- Huntington, Elisha
- Hupp, John Cox
- Hurd, Anson
- Hurd, Edward Payson
- Husk, Carlos Ellsworth
- Huston, Robert Mendenhall
- Hutchinson, James
- Hutchinson, James Howell
- Hutchinson, Edwin
- Hutchison, Joseph Chrisman
- Hyatt, Elijah H.
- Hyde, Frederick
- Hyde, James Nevins
- Hyde, Miles Goodyear, see Hyde, Frederick
Hyndman—Jennings
- Hyndman, James Gilmour
- Ingals, Ephraim
- Ingals, Ephraim Fletcher
- Ingalls, William (1769–1851)
- Ingalls, William (1813–1903), see Ingalls, William (1769–1851)
- Irvine, William
- Isaacs, Charles Edward
- Isham, Asa Brainerd
- Isham, Mary Keyt, see Isham, Asa Brainerd
- Isham, Ralph Nelson
- Ives, Ansel W.
- Ives, Charles Linnæus, see Ives, Eli
- Ives, Eli
- Ives, Levi, see Ives, Eli
- Jackson, Abraham Reeves
- Jackson, Charles Thomas
- Jackson, David, see Jackson, Samuel
- Jackson, Hall
- Jackson, James (1777–1867)
- Jackson, James (1810–1834)
- Jackson, John Barnard Swett
- Jackson, John Davies
- Jackson, Samuel
- Jacobi, Mary Putnam
- Jacobson, Nathan
- James, Edwin
- James, Martin L.
- James, Thomas Chalkley
- James, William
- Jameson, Horatio Gates
- Janeway, Edward Gamaliel
- Janeway, Theodore Caldwell
- Janvrin, Joseph Edward
- Jarvis, Edward
- Jarvis, William Chapman
- Jay, John Clarkson
- Jayne, David, see Jayne, Horace Fort
- Jayne, Horace Fort
- Jeffries, Benjamin Joy
- Jeffries, John (1745–1819)
- Jeffries, John (1796–1876), see Jeffries, John (1745–1819)
- Jelly, George Frederick
- Jenkins, John Foster
- Jenks, Edward Watrous
- Jennings, Samuel Kennedy (1771–1854)
- Jennings, Samuel Kennedy (1796–1877), see Jennings, Samuel Kennedy (1771–1854)
Jervey—Kelly
- Jervey, James Postell
- Jewell, James Stewart
- Jewell, Wilson
- Jewett, Charles
- Jewett, Theodore Herman
- Johnson, Charles Earl
- Johnson, Edward
- Johnson, Francis Marion
- Johnson, Henry Lowry Emilius
- Johnson, Hosmer Allen
- Johnson, Joseph
- Johnson, Laurence
- Johnston, Christopher
- Johnston, George Benjamin
- Johnston, William Patrick
- Johnston, William Waring
- Johnston, Wyatt Galt
- Johnstone, Arthur Weir
- Johnstone, Robert
- Jones, Calvin
- Jones, Ichabod Gibson
- Jones, James
- Jones, James Robert
- Jones, John
- Jones, Johnston Blakely
- Jones, Joseph
- Jones, Oswald Meredith
- Jones, Philip Mills
- Jones, Samuel Jones
- Jones, Walter
- Jones, William Palmer
- Joyce, Robert Dwyer
- Joynes, Levin
- Judd, Gerrit Parmele
- Judson, Adoniram Brown
- Kane, Elisha Kent
- Kassabian, Mihran Krikor
- Keagy, John M.
- Kearsley, John
- Keating, John Marie
- Keating, William Valentine
- Kedzie, Frank, see Kedzie, Robert Clark
- Kedzie, Robert Clark
- Kellogg, Albert
- Kelly, Aloysius Oliver Joseph
Kelsey—Langley
- Kelsey, Charles Boyd
- Kempster, Walter
- Kennedy, Alfred L.
- Kerlin, Isaac Newton
- Keyser, Peter Dirck
- Keyt, Alonzo Thrasher
- Kidder, Jerome Henry
- Kilpatrick, Andrew Robert
- Kilty, William
- Kimball, Gilman
- King, Albert Freeman Africanus
- King, Alfred
- King, Dan
- King, David (1774–1836)
- King, David (1812–1882)
- King, John
- Kinlock, Robert Alexander
- Kinnicutt, Francis Parker
- Kipp, Charles John
- Kirkbride, Thomas Story
- Kirkpatrick, Robert Charles
- Kirtland, Jared Potter
- Kissam, Richard Sharp
- Kittredge, Thomas, see Goodhue, Josiah
- Kleinschmidt, Carl Hermann Anton
- Knapp, Jacob Hermann
- Knapp, Moses L.
- Kneeland, Samuel
- Knieskern, Peter D.
- Knight, Charles Huntoon
- Knight, Frederick Irving
- Knight, James
- Knight, Jonathan
- Kollock, Cornelius
- Krackowizer, Ernst
- Kraemer, Adolph
- Kreider, Michael Zimmermann
- Kuhn, Adam
- Kyle, David Braden
- LaChapelle, Emanuel Persillier
- Lambert, Thomas Scott
- Lamson, Daniel Lowell
- Landis, John Howard
- Lane, Levi Cooper
- Langley, John Williams