Name
- O'Reilly, Thomas1
- Ompteda, Friedrich August, Baron1
- Onslow, Thomas, Viscount Cranley; 2nd Earl of Onslow 18141
- Ormerod, Thomas Johnson, Archdeacon of Suffolk 18461
- Orr, John, Lieutenant-General1
- Osborne, Charlotte, wife of George 6th Duke of Leeds1
- Osborne, George William Frederick, 6th Duke of Leeds, d 18381
- Ottley, Adam, of Pitchford, county Shropshire1
- Ottley, Thomas, of Pitchford1
- Owen, John, 1st Baronet 1813, of Orielton, MP for Pembrokeshire1
- Owen, Robert, socialist and philanthropist1
- Owen, William, 8th Baronet 18171
- Pain, Thomas, of Dover, Registrar of the Cinque Ports1
- Palletta, Giovanni Battista, Professor; surgeon, of Milan1
- Paoli-Chagny, Comte de1
- Parker, George, 4th Earl of Macclesfield1
- Parker, John, 1st Earl of Morley, politician, 1772-1840, http://isni.org/isni/000000... http://viaf.org/viaf/560352111
- Parkins, Joseph Wilfred, formerly Sheriff of London1
- Parnell, Hugh1
- Partridge, Thomas, estate factor, of Hawkesbury1