Name
- O'Brien, Lucius Henry, 3rd Baronet1
- O'Hara, James, 2nd Baron Tyrawley1
- Ord, Robert, Chief Baron of the Scottish Exchequer1
- Osbaldeston, Richard, Bishop of London1
- Osborn, George, 4th Baronet1
- Osborne, Thomas, 4th Duke of Leeds1
- Oxenden, George, 5th Baronet, MP1
- Palliser, Hugh, Governor of Newfoundland, 1st Baronet 17731
- Parker, Thomas, Knight , Chief Baron of the Exchequer1
- Parker, Thomas, Viscount Parker, 3rd Earl of Macclesfield 17641
- Peirce, Jeremy, surgeon1
- Pelham, Henry, Prime Minister, 1694-17541
- Penn, Thomas, Joint Proprietor of Pennsylvania1
- Peter III, of Russia1
- Philipps, W1
- Pitt, George, 1st Baron Rivers of Stratfieldsaye 17761
- Pitt, —1
- Pittis, William, Fellow of New College Oxford1
- Post Office1
- Potter, Thomas, the elder, MP1