Authors: Williams
- Pierson, William Whatley, Jr. 1890-1966
- Piesse, G. W. Septimus (George William Septimus) 1820-1882
- Pilling, William 1834-
- Pinnock, William 1782-1843
- Pitcher, William J. C. 1858-1925
- Pittenger, William 1840-1904
- Pitt, William 1759-1806
- Platt, William 1867-
- Platt, William, Mrs. -
- Playfair, William 1759-1823
- Plumer, William S. (William Swan) 1802-1880
- Poel, William 1852-1934
- Polidori, John William 1795-1821
- Pollard, Alfred W. (Alfred William) 1859-1944
- Ponsonby, Arthur Ponsonby, Baron 1871-1946
- Poole, Bertram W. H. (Bertram William Henry) 1880-1957
- Poole, William Frederick 1821-1894
- Porter, Sara Lindsay Coleman 1868-1959
- Potter, Margaret Horton 1881-1911
- Potts, William Sherman 1876-1930
- Pound, Ezra 1885-1972
- Powell, William Robert 1876-
- Power, Tyrone 1797-1841
- Power, William Henry, Sir 1842-1916
- Pratt, William Edwin -
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