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- O'Sullivan, Vincent 1868-1940
- Othegraven, Reinhold Pfahler von -
- Ottmann, Victor 1869-1944
- Otto-Kreckwitz, Ernst von 1861-1938
- Ottolini, V. (Vittore) 1825-1892
- Packard, Vance 1914-1996
- Pagé, Victor Wilfred 1885-1947
- Painter, F. V. N. (Franklin Verzelius Newton) 1852-1931
- Palacio Valdés, Armando 1853-1938
- Paltsits, Victor Hugo 1867-1952
- Papias, Saint, Bishop of Hierapolis -
- Papp, Viktor 1881-1954
- Paracelsus 1493-1541
- Pareto, Vilfredo 1848-1923
- Parkhill, Forbes 1892-1974
- Parkhurst, Harry L. V. 1876-1962
- Parny, Évariste 1753-1814
- Parrington, Vernon Louis 1871-1929
- Pascoais, Teixeira de 1877-1952
- Passer, Arnold von der 1851-1917
- Patrick, C. Vincent -
- Patterson, Virginia Sharpe 1841-1913
- Paulinus, a S. Bartholomaeo 1748-1806
- Payer, Julius 1841-1915
- Peacock, Virginia Tatnall 1873-1918