Name
- Nihell, John, Chief Judge of Trinidad1
- O'Neil, Thomas, Lieutenant; Royal Marines1
- Oaken, Hildebrand, 1st Baronet 1813, Lieutenant-General; Commander-in-chief al Malta1
- Owen, John, 1st Baronet 1813, of Orielton, MP for Pembrokeshire1
- Page, Robert, merchant, of Madeira1
- Pakenham, Thomas, 2nd Earl of Longford1
- Parker, Deane John, of Add MS 382501
- Pelham, Thomas, Baron Pelham, 2nd Earl of Chichester1
- Peltier, Jean Gabriel, French journalist1
- Perceval, Spencer, Prime Minister of the United Kingdom, 1762-18121
- Percy, Hugh, formerly Smithson 2nd Duke of Northumberland1
- Perrott, Edward Bindloss, self-styled Baronet1
- Plunkett, Elizabeth, widow of Major James Plunkett1
- Pohlman, John George, of the Audit Office1
- Portman, Henry Berkeley1
- Pratt, John Jeffreys, 2nd Earl and 1st Marquess Camden, 1759-18401
- Puisaye, Joseph Geneviève, Marquis de Menilles; Comte1
- Puleston, Richard, 1st Baronet1
- Ricketts, Ellen, wife of C M Ricketts1
- Rivière, of the French Ministry of Marine1