Name
- Jenkinson, Charles, 1st Earl of Liverpool, 1727-18081
- Jenkinson, Family1
- Jennings, Henry Constantine, of the Commissariat1
- Johnson, Thomas, of the Secret Service1
- Johnston, Arthur, of Fethard, county Tipperary1
- Johnston, James, naval officer1
- Joseph Bonaparte, of Spain1
- Juvalta, Wolfgang, agent of Count John de Salis1
- Kaye, John Lister, 1st Baronet 18121
- Kendall, Edward Augustus1
- Kent, William1
- Kenyon, George, 2nd Baron Kenyon1
- Langham, William, 8th Baronet1
- Lascelles, Henry, Viscount Lascelles, afterwards 2nd Earl of Harewood1
- Leiningen, Christian Ludwig Alexander, Count, Austrian Lieutenant -Colonel1
- Lennox, Charles, 4th Duke of Richmond and Lennox1
- Lima, Antonio Luiz1
- Lloyd, Amelia, widow of Sir E Lloyd, 1st Baronet1
- Long, Beeston, merchant, of London1
- Long, Charles, Baron Farnborough (1826), Secretary to the Treasury, Chief Secretary for Ireland1