Authors: R.
- Perés, Ramón D. (Ramón Domingo) 1863-1956
- Peter, Robert 1805-1894
- Peterson, Charles J. (Charles Jacobs) 1819-1887
- Peterson, Steven R. -
- Peyser, Ethel R. (Ethel Rose) 1887-1961
- Phillips, R. -
- Phillips, R. (Richard), Sir 1767-1840
- Philp, Robert Kemp 1819-1882
- Phipps, Ramsay Weston 1838-1923
- Pious, Robert S. (Robert Savon) 1908-1983
- Pitman, Emma Raymond -
- Pitts, J. R. S. (James Robert Soda) 1832-1920
- Planché, J. R. (James Robinson) 1796-1880
- Platt, Dwight R. 1931-
- Playfair, R. Lambert (Robert Lambert), Sir 1828-1899
- Playtner, H. R. -
- Plomer, Henry R. (Henry Robert) 1856-1928
- Pocock, Roger 1865-1941
- Poinsatte, Charles R. -
- Polkinghorne, M. I. R. (Mabel Irene Rutherford) -
- Polkinghorne, R. K. (Ruby Kathleen) -
- Poore, Henry Rankin 1859-1940
- Pope, R. Martin (Robert Martin) 1865-1944
- Porati, R. A. -
- Potter, Israel 1744-
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