- Morton Testimonial Association.9
- Morton, W. T. G. (William Thomas Green), 1819-18689
- Niemeyer, Felix von, 1820-18719
- Ochsner, Albert J. (Albert John), 1858-1925, author9
- Ohio. Department of Health. Adult Hygiene Division, author.9
- Pancoast, Joseph, 1805-18829
- Pearson, Steve, author9
- Peaslee, E. R. (Edmund Randolph), 1814-18789
- Peters, John C. (John Charles), 1819-1893, author9
- Philadelphia Medical Society.9
- Piffard, Henry G. (Henry Granger), 1842-1910, author9
- Pirogov, Nikolaĭ Ivanovich, 1810-1881, author9
- Pooley, J. H. (James Henry), 1839-1897, author9
- Priestley, Joseph, 1733-18049
- Providence (R.I.). Board of Health, author.9
- Rae, Matthew, author9
- Ramos, Christal, author9
- Realmuto, Lindsey, author9
- Reed, Sarah Jane, author9
- Reese, John J. (John James), 1818-18929