Name
- O'Hara, Charles, MP1
- O'Meara, Richard, Captain1
- O'Reilly, Colonel1
- Ogle, John, Colonel; of Add MS 331031
- Olivier, Isaline1
- Ormsby, Charles Montague, MP1
- Orr, G-1
- Oswald, John1
- Ouseley, William, orientalist, 1767-18421
- Pagowski, Alexandre, Comte1
- Pakenham, Thomas, Surveyor-General of Ordnance in Ireland1
- Palmer, Joseph, Dean of Cashel1
- Papillon, Anne1
- Parker, John, 1st Baron Boringdon1
- Parker, John, 1st Earl of Morley, politician, 1772-1840, http://isni.org/isni/000000... http://viaf.org/viaf/560352111
- Parker, Thomas, Viscount Parker, 3rd Earl of Macclesfield 17641
- Parnell, John, 2nd Baronet, MP for Queen's County; afterwards Irish Chancellor of the Exchequer1
- Partington, Henry, Collector of Customs at Shoreham1
- Paterson, James, Clerk of the Crown1
- Pearce, John, Lieutenant1