Names
- Ostwald, Wilhelm, 1853-1932.1
- Overberger, C. G. (Charles Gilbert), 1920-1
- Paneth, Fritz, 1887-1958.1
- Pauli, Wolfgang, 1900-1958.1
- Pauling, Linus, 1901-1994.1
- Pennsylvania State University.1
- Pettee, William Henry, 1838-1904.1
- Philip Elving1
- Pitcher, Zina, 1797-1872.1
- Purdue University.1
- Reed, Walter, 1851-1902.1
- Reighard, Jacob, 1861-1942.1
- Rich, John Treadway, 1841-1926.1
- Richard Bernstein1
- Richards, Theodore W. (Theodore William), 1868-1928.1
- Ricketts, Howard Taylor, 1871-1910.1
- Robert Elderfield1
- Rose, Preston Benjamin, 1834-1912.1
- Ross, Ronald, Sir, 1857-1932.1
- Rossini, Frederick D. (Frederick Dominic), 1899-1