Authors: O
- Slesar, Henry 1927-2002
- Sloane, T. O'Conor (Thomas O'Conor) 1851-1940
- Small, F. O. (Frank O.) 1860-1915
- Smarandache, Florentin 1954-
- Smeaton, William Henry Oliphant 1856-1914
- Smith, Elizabeth Oakes Prince 1806-1893
- Smith, George O. (George Oliver) 1911-1981
- Smith, George Otis 1871-1944
- Smith, Jeanie Oliver Davidson 1836-1925
- Smith, Otterbein Oscar 1858-
- Solberg, Charles O. (Charles Orrin) 1869-1944
- Solbert, Oscar N. 1885-1958
- Solkio, Olli -
- Somerville, E. Oe. (Edith Oenone) 1858-1949
- Sommer, H. B. -
- Sommer, H. Oskar (Heinrich Oskar) 1861-
- Spafford, Oliver -
- Speckter, Otto 1807-1871
- Spencer, Orson 1802-1855
- Spengler, Oswald 1880-1936
- Spokeshave -
- Štáfl, Ot. (Otakar) 1884-1945
- Starke, Ottomar 1886-1962
- Stearns, Oliver 1807-1885
- Stein, Armin 1840-1929
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