Name
- Imbert-Colomés, Jacques Pierre, French politician1
- Jackson, George, KCH 1832; diplomatist, fl 18321
- Jackson, Thomas, diplomatist1
- Jenkinson, Robert Banks, Baron Hawkesbury, 2nd Earl of Liverpool, Prime Minister, 1770-18281
- Jery, Toussaint, of Marseilles1
- John VI, Duke of Brunswick-Lüneburg1
- Jons, Abbé1
- Ketelhodt, Baron, of Berlin1
- Khevenhüller, Count, Austrian Commissary-General in Italy1
- King, John, Under-Secretary of State, Home Office; of Add MS 468371
- La Combe, Abbé1
- Leekeny, Friedrich Johann Heinrich, of Magdeburg1
- Lefferer, Thomas, Secretary to Lord Galway1
- Leonetti, Felice Antonio, Corsican politician1
- Leroy, Secretary to Comte d'Antraigues1
- Ley, George, of Trefusis Mylor1
- Lindsey, Thomas, of Add MS 468221
- Liston, Robert, diplomatist; GCB 18161
- Lonjamet, French royalist1
- Lorraine, Ferdinand III, Grand Duke of Tuscany, prince-elector, 1769-18241