- Paine, Martyn, 1794-1877, author1
- Pässing, Joh. Matheiss (Johann Matheiss)1
- Pereira, Jonathan, 1804-1853, author1
- Philadelphia College of Pharmacy (1822-1921)1
- Pompa, Gerónimo, author1
- Ponteus, John, author1
- Poultney, Samuel.1
- Priest, Michael L.1
- Robson, Thomas.1
- Rodman, William Woodbridge, 1817-19001
- Rogers, J. Smyth (John Smyth), 1794-18511
- Roth, Otto, author1
- Ruble, Thomas W. (Thomas White), 1765-1
- Rudolphy, John, author1
- Rusby, Henry Hurd, 1855-1940, author1
- Rymer, James, active 1770-18331
- Salazar, Juan de Dios, 1776-18561
- Sayre, Lucius E. (Lucius Elmer), 1847-1925, author1
- Schleif, William, 1868- author1
- Schmidt, Daniel.1