Name
- Moncreiff, James Wellwood, 1st Baron1
- Moonlight, Captain, pseudonym1
- Moore, William, RC priest of Haydock St Helens1
- Morris, Michael, Baron Morris of Spiddal, 1st Baron Killanin1
- Morton, Hugh, of Newark Notting1
- Moss, William, of Harrow Liberal Club1
- Mundella, Anthony John, PC, MP1
- Near, Isaac, of Dormans Land Surrey1
- Noel, Ernest, MP1
- O'Brien, Richard Barry, author1
- O'Brien, William, MP, founder of the United Irish League, 1852-19281
- O'Leary, Richard, Sergeant . RE1
- O'Shea, Katharine, afterwards Parnell wife of Captain W H O'Shea1
- O'Shea, William Henry, Irish politician1
- Old Admirer, An, pseudonym1
- Padfield, S, of Newport Mon1
- Palmer, Roundell, 1st Baron and 1st Earl of Selborne, Lord Chancellor1
- Parker, Albert Edmund, 3rd Earl of Morley1
- Pattinson, John, of Gateshead1
- Pease, Joseph Whitwell, 1st Baronet, industrialist and banker, 1828-19031