- Jenkyn, William, 1613-16851
- Jesse Haney & Co. (New York, N.Y.) 1
- Jocelyn, Simeon Smith, 1799-18791
- Johnson, George C.--Claims vs. United States1
- Johnson, Samuel, 1649-17031
- Johnson, Samuel, 1709-17841
- Johnsonians (Society)1
- Jones, W. Claude1
- Judson, Adoniram, 1788-18501
- Kant, Immanuel,--1724-18041
- Keimer, Samuel,--1688-1742.1
- Kingsley, James Luce,--1778-1852--Autograph.1
- Kotelchuck, David1
- Ku Klux Klan (1915- )--Recruiting, enlistment, etc.1
- Ku Klux Klan (1915- ). El Reno Klan No. 15 (El Reno, Okla.)1
- L'Estrange, Roger, Sir, 1616-17041
- Lamoignon de Basville, M. de (Nicolas), 1648-17241
- Lane Gold Mining Co1
- Lane, Thomas, 1652-17091
- Lauderdale, John Maitland, Duke of, 1616-16821
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