| Henry A. (Henry Augustus) Shute | 1856–1943 | 2 |
| Harold Sichel | 1881–1948 | 1 |
| Frank Sidgwick | 1879–1939 | 4 |
| Margaret Sidney | 1844–1924 | 8 |
| Philip Sidney | 1554–1586 | 1 |
| Samuel Sidney | 1813–1883 | 1 |
| Henryk Sienkiewicz | 1846–1916 | 7 |
| Albert Frederick Siepert | born 1883 | 1 |
| L. H. (Lydia Howard) Sigourney | 1791–1865 | 1 |
| Jóhann Sigurjónsson | 1880–1919 | 1 |
| Una L. Silberrad | 1872–1955 | 1 |
| Juhani Siljo | 1888–1918 | 2 |
| Antonio da Silva Pinto | 1848–1911 | 1 |
| Joaquim Possidónio Narciso da Silva | 1806–1896 | 2 |
| Luiz Augusto Rebello da Silva | 1822–1871 | 1 |
| Robert Silverberg | born 1935 | 4 |
| Armand Silvestre | 1837–1901 | 2 |
| Clifford D. Simak | 1904–1988 | 2 |
| P. L. (Peter Lund) Simmonds | 1814–1897 | 1 |
| W. H. (William Herbert) Simmons | 1880–1960 | 1 |
| William Gilmore Simms | 1806–1870 | 5 |
| William Day Simonds | 1855–1920 | 1 |
| William Edward Simonds | 1860–1947 | 1 |
| E. Blantyre (Evelyn Blantyre) Simpson | 1856–1920 | 1 |
| Percy Simpson | 1865–1962 | 1 |
| Barbara R. (Barbara Rutledge) Sims | 1918–2002 | 1 |
| George R. (George Robert) Sims | 1847–1922 | 1 |
| Bertrand W. Sinclair | 1881–1972 | 6 |
| May Sinclair | 1863–1946 | 15 |
| Upton Sinclair | 1878–1968 | 21 |
| Samuel Weller Singer | 1783–1858 | 1 |
| Esther Singleton | 1865–1930 | 2 |
| A. P. (Alfred Percy) Sinnett | 1840–1921 | 1 |
| R. U. Sirius | born 1952 | 1 |
| Eero Sissala | 1851–1909 | 2 |
| Florence Alice Sitwell | 1858–1930 | 1 |
| Walter W. (Walter William) Skeat | 1835–1912 | 3 |
| Leonard Skeats | 1874–1943 | 1 |
| Wilfred S. (Wilfred Stradling) Skeats | 1864–1934 | 1 |
| Joseph Ratcliffe Skelton | 1865–1927 | 1 |
| Oscar D. (Oscar Douglas) Skelton | 1878–1941 | 1 |
| Ada M. (Ada Maria) Skinner | born 1878 | 1 |
| Charles M. (Charles Montgomery) Skinner | 1852–1907 | 11 |
| Constance Lindsay Skinner | 1882–1939 | 1 |
| E. F. (Edward Frederick) Skinner | 1865–1924 | 1 |
| Richard Skowronnek | 1862–1932 | 1 |
| Francis Henry Skrine | 1847–1933 | 1 |
| John Huntley Skrine | 1848–1923 | 1 |
| J. Atwood (John Atwood) Slater | 1857–1935 | 1 |
| John Rothwell Slater | 1872–1965 | 1 |
| John T. (John Theodore) Slattery | 1866–1938 | 1 |
| Pencho P. Slaveikov | 1866–1912 | 2 |
| Benjamin Franklin Sledd | 1864–1940 | 1 |
| Sleeman, W. H. (William Henry), Sir | 1788–1856 | 2 |
| John Sherburne Sleeper | 1794–1878 | 1 |
| J. Morris (Josiah Morris) Slemons | 1876–1948 | 1 |
| Henry Slesar | 1927–2002 | 1 |
| John Sloan | 1871–1951 | 1 |
| Julia M. (Julia Moss) Sloane | 1877–1919 | 1 |
| William Milligan Sloane | 1850–1928 | 1 |
| Joshua Slocum | 1844–1910 | 2 |
| Annie Trumbull Slosson | 1838–1926 | 2 |
| Edwin E. (Edwin Emery) Slosson | 1865–1929 | 2 |
| Nahum Slouschz | 1872–1966 | 2 |
| Hendrik Sluijters | 1807–1859 | 1 |
| Jan Sluijters | 1881–1957 | 2 |
| Janet Smalley | born 1893 | 1 |
| Florentin Smarandache | born 1954 | 1 |
| Christopher Smart | 1722–1771 | 1 |
| Hawley Smart | 1833–1893 | 1 |
| William Henry Oliphant Smeaton | 1856–1914 | 1 |
| Frank E. (Frank Edward) Smedley | 1818–1864 | 1 |
| W. T. (William Thomas) Smedley | 1858–1920 | 3 |
| Samuel Smiles | 1812–1904 | 10 |
| Adam Smith | 1723–1790 | 1 |
| Alice Prescott Smith | 1868–1930 | 1 |
| Arthur Cosslett Smith | 1852–1926 | 1 |
| Buckingham Smith | 1810–1871 | 1 |
| C. Alphonso (Charles Alphonso) Smith | 1864–1924 | 1 |
| Cecil Smith | 1826–1890 | 1 |