- Simon, William, 1844-1916, author1
- Simons, T. Grange (Thomas Grange), 1843-1927, author1
- Sinkler, Wharton, 1845-1910, author1
- Sizer, Nelson, author1
- Skene, Alexander J. C. (Alexander Johnston Chalmers), 1838-1900, author1
- Skinner, D. N. (Davis Nevens), 1841-1892, author1
- Smith, A. Lapthorn (Arthur Lapthorn), 1855-1937, author1
- Solis-Cohen, Solomon, 1857-19481
- Solly, S. Edwin (Samuel Edwin), 1845-1906 author1
- Spivak, C. D. (Charles D.), 1861-1927, author1
- Starr, Louis, 1849-19251
- Stavely, A. L., 1863-1939 author1
- Stedman, Henry R. (Henry Rust), 1849-1926 author1
- Stewart, David D. (David Denison), 1858-1905, author1
- Stewart, John Pope, 1864- author1
- Stone, Arthur K. (Arthur Kingsbury), 1861- author1
- Stowell, T. B. (Thomas Blanchard), 1846-1927 author1
- Strong, Charles P. (Charles Pratt), 1855-18931
- Students' Movement of New York City, author.1
- Taylor, Lewis Harlow, author1