Authors: R.
- Owen, Robert Emmett 1878-1957
- Pacho, Jean-Raimond 1794-1829
- Packard, Francis R. (Francis Randolph) 1870-1950
- Palma, Ricardo 1833-1919
- Palmer, Ray 1910-1977
- Pansy 1841-1930
- Pardee, R. G. (Richard Gay) 1811-1869
- Parke, Robert, active 1588 -
- Parkin, George R. (George Robert) 1846-1922
- Park, John Ranicar 1778-1847
- Parkman, Mary Rosetta 1875-1941
- Park, Philip Ryder 1870-
- Patton, David R. -
- Paul, Frank R. (Frank Rudolph) 1884-1963
- Payne, Bruce Ryburn 1874-1937
- Payró, Roberto Jorge 1867-1928
- Pears, James Roberts -
- Peary, Robert E. (Robert Edwin) 1856-1920
- Pease, Edward R. (Edward Reynolds) 1857-1955
- Peck, Rufus H. -
- Peele, John (John R.) -
- Peery, R. B. (Rufus Benton) 1868-
- Peiper, C. R. S. (Carl Rudolph Samuel) 1798-1879
- Pennell, Elizabeth Robins 1855-1936
- Pennell, Robert F. 1850-1905
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