Letters to William Pitt jun., from: Oakes, R., Obell, Carl von, O'Bryan, John, (2) O'Cahill, Baron, (2) O'Connell, General, O'Connor, Charles, O'Connor, Capt. James, (3) O'Connor, Jeremiah, O'Connor, Samuel O'Dogherty, Capt., O'Dwyer, Morgan, O'Farrell, Capt., Ogilvie, William, (7) Ogle, George, Ogle, William, Oglou, Sieur Canales, O'Hara, Dan, O'Hara, James O'Hara, Patrick, Oke, W., O'Keeffe, J., (dramatist) Oldridge, William, Olier, Robert Henry d', Oliver, Michael, Oliver, Sam., Oliver, Thomas, Olmius, John, (9) Onion, D., Onslow, George, Lord Onslow, (2) Onslow, Dr. Arthur, Onslow, Richard, Orchard, Henry M., Orchard, Paul, Ord, Rev. Dr. John, (8) (Orde, Thomas, see Bolton, Lord) Orford, 3rd Earl of, (George Walpole) (6) Orlebar, Richard, Orly, M. de., Orme, Robert Oroix, Capt. d', Osbaldistone, George, Osborn, Sir George, (4) Osborn, J., Osborn, John, (3) Osborne, Capt. Jos. (2) Osbourne, William, Osgoode, William, Ossery, Lady (Anne, wife of Walter, Lord Ossory) (2) Oswin, Richard, O'Toole, Colonel, (4) Ottley, Drewry, Otway, Mrs. Melliora, Owen, Col. Arthur, Owen, David, Owen, Lady (widow of Sir Hugh) Owens, Mrs, Oxenden, Sir Henry, (Oxford, Bishop of, see Butler, Dr John) Oxford, Earl of, (Edward Harley) Oxmantown, Lord, (Lawrence Parsons)