Name
- Nevill, Anne, wife of George 13th Lord Abergavenny1
- Nevill, George, 13th Lord Abergavenny1
- O'Brien, Patrick, 2nd Baronet, Irish politician; of Ossory, 1823-18951
- O'Brien, William, MP, founder of the United Irish League, 1852-19281
- O'Conor, Charles Owen, The O'Conor Don, MP1
- O'Hagan, John, Irish judge1
- O'Hagan, Thomas, 1st Baron O'Hagan1
- O'Sullivan, David1
- Ochedo, Tomaso de, book collector1
- Palles, Christopher, Irish judge1
- Palmer, Roundell, 1st Baron and 1st Earl of Selborne, Lord Chancellor1
- Palmer, William Waldegrave, 2nd Earl of Selborne, politician, 1859-19421
- Parker, Albert Edmund, 3rd Earl of Morley1
- Peel, Charles Lennox, GCB1
- Pembroke, William, agent of 2nd Earl Spencer1
- Petty-Fitzmaurice, Edmond George, alias Lord Edmond Fitzmaurice, Baron Fitzmaurice, politician and historian, 1846-19351
- Playfair, Lyon, 1st Baron Playfair, politician and chemist, 1818-18981
- Ponsonby, Henry Frederick, Knight, army officer and private secretary to Queen Victoria, 1825-18951
- Porter, Andrew Marshall, solicitor-general for Ireland1
- Power, Alfred, of the Irish Local Government Board1