- Ruschenberger, W. S. W. (William Samuel Waithman), 1807-1895, author1
- Sachs, Bernard, 1858-1944, author1
- Sadtler, Samuel P. (Samuel Philip), 1847-1923, author1
- Sanitary Protection Association (Newport, R.I.), author.1
- Saundby, Robert, 1849-19181
- Schapringer, A. (Alois), author1
- Schreiber, August, 1853-19241
- Schüssler, Wilhelm Heinrich, 1821-18981
- Scudder, John M. (John Milton), 1829-18941
- Seaman, William H., 1837-1910, compiler1
- Seguin, E. C. (Edward Constant), 1843-1898, author1
- Segura, José C. (José Carmen), 1845-1906, author1
- Senn, Nicholas, 1844-19081
- Shaffer, Newton M. (Newton Melman), 1846-1928 author1
- Sheild, A. Marmaduke (Arthur Marmaduke), 1858-19221
- Shufeldt, Robert W. (Robert Wilson), 1850-19341
- Shufeldt, Robert W. (Robert Wilson), 1850-1934 author1
- Shurly, E. L. (Ernest Lorenzo), 1845-1913, author1
- Siegler, L. Frank, author1
- Simes, J. Henry C., 1844-1907, author1