Authors: Henry
- Pierce, Henry Niles 1820-1899
- Pierné, Gabriel 1863-1937
- Pierson, Henry Hugo 1815-1873
- Pike, H. Lee M. (Henry Lee Mitchell) 1865-
- Pilsbry, Henry Augustus 1862-1957
- Piper, H. Beam 1904-1964
- Pirenne, Henri 1862-1935
- Pitt-Rivers, Augustus Henry Lane-Fox 1827-1900
- Pitt-Rivers, George Henry Lane Fox 1890-1966
- Pitz, Henry C. (Henry Clarence) 1895-1976
- Plomer, Henry R. (Henry Robert) 1856-1928
- Plummer, Henry Merrihew 1865-1928
- Pocock, Roger 1865-1941
- Pohjanpää, Lauri Henrik 1889-1962
- Poincaré, Henri 1854-1912
- Pontoppidan, Henrik 1857-1943
- Poole, Bertram W. H. (Bertram William Henry) 1880-1957
- Poore, Henry Rankin 1859-1940
- Porter, Henry, M. D. -
- Potter, Henry Austin 1869-
- Pouchet, G. (Georges) 1833-1894
- Power, William Henry, Sir 1842-1916
- Pratt, Henry -
- Preble, George Henry 1816-1885
- Prentout, Henri 1867-1933
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