- Paine, H. M. (Horace Marshfield), 1827-1903, author1
- Palmer, Alonzo Benjamin, 1815-18871
- Parsons, S. B. (Scott Burrill), 1842-1900, compiler1
- Payne, W. E. (William E.), 1815- author1
- Potter, Samuel O. L. (Samuel Otway Lewis), 1846-1914, author2
- Pulte, J. H. (Joseph Hippolyt), 1811-18843