Name
- O'Donovan, John, Lieutenant1
- O'Ferrall, Captain1
- O'Shanly, J-, Lieutenant1
- O'Sullivan, Major1
- Ogilvie, William, Surgeon1
- Ompteda, Dietrich Heinrich Ludwig von?, Hanoverian minister at the Diet of the Empire1
- Ompteda, wife of Dietrich Heinrich Ludwig, Freiherr von Ompteda (?)1
- Osborn, George, 4th Baronet1
- Paar, Johann Wenzel, Prince1
- Paar, Wenzel, Count1
- Palmer, Charles Fyshe1
- Panin, Nikita Ivanovitch, Russian Foreign Minister1
- Parker, Charles, of Add MS 355321
- Partz, E- L-, Secrétaire des Dépêches du Roi, Hanover1
- Paxton, Archibald1
- Payne, Ralph, 1st Baron Lavington1
- Pelham, Thomas, 1st Earl of Chichester1
- Pelham-Clinton, Henry Fiennes, 2nd Duke of Newcastle1
- Pergen, Christianne1
- Pergen, Johann Anton, Count1