Name
- Norton, Robert, of Add MS 282301
- O'Brien, Charles, 6th Viscount O'Brien, of Clare, Marshal Thomond1
- O'Ferral, James, Lieutenant1
- Odescalchi, Livio, Duke of Ceri and Bracciano1
- Odoardo, Duke of Parma1
- Okey, Samuel1
- Orléans, Anne Marie Loulse, Duchesse de Montpensier1
- Orléans, Elizabeth Charlotte, 2nd wife of Philip I, Duke of Orleans1
- Orléans, Isabelle, Mlle d'Alençon1
- Orléans, Philippe, Duc d'; of Add MS 203151
- Orsini, Domenico, Cardinal, Abbate e Commendator della Badia di S Benedetto in Salerno, Duke of Gravina1
- Orsini, Flavio, Duca di Bracciano1
- Osborn, George, of Add MS 282311
- Osborne, Marcellus, of Add MS 282361
- Page, John, MP for Chichester1
- Palmer, Allwyn1
- Pamphili, Benedetto, Cardinal writer1
- Pamphili-Aldobrandini, Violante Faschinetti, wife of G B, Prince of Caspinetti1
- Parham, Thomas, of Add MS 282291
- Parker, Mary, of Add MS 282321