- Sincero, Dino (1872-1923)
- Sinclair, Angus J. F.
- Sinclair, Charles William
- Sinclair, Dr George Robertson (1863-1917)
- Sinclair, William J. P. (1889-)
- Sinding, Christian (1856-)
- Singenberger, Johann (1848-1924)
- Singery, Gaston (1893-1942)
- Singh, Prabhu (1937-)
- Singleton, Geoffrey (1929-)
- Singleton, Whiteley (1885-)
- Sinnett, Herbert Edwin (1870-1945)
- Sinsoilliez, Gabriel (1846-1893)
- Sinzheimer, Dr Max (1894-1977)
- Sipilä, Eero Aukusti (1918-1972)
- Sircom, Edwin Hobhouse (c1814-1893)
- Sirén, Yngve (1928-1999)
- Siret, Nicolas (1663-1754)
- Sirulnikoff, Jack (1931-)
- Sisask, Urmas (1960-)
- Siskind, Dr Paul (1962-)
- Sisler, Hampson Albert (1932-)
- Sitsky, Larry (1934-)
- Sittard, Alfred (1878-1942)
- Sivert, Paul (1586-1666)
- Sizes, Eugène Gabriel (1856-1946)
- Sjöberg, Johann Magnus Göran (1953-)
- Sjöblom, Heimer (1910-2001)
- Sjögren, Albert junior (1934-2001)
- Sjögren, Johann Gustav Emil (1853-1918)
- Skaalen, Peter A. (1948-)
- Skagerberg, Einar (1876-1969)
- Skarecky, Jana (1957-)
- Skarlette, John
- Skauen, Guttorm (1920-)
- Skeats, Highmore senior (1760-1831)
- Skeats, Highmore junior (1787-1835)
- Skeele, W. F.
- Skelton, George
- Skelton, George James (1801-c1866)
- Skidmore, Harold Gwilliam (1889-)
- Skill, Bertha (c1901-)
- Skilton, Charles Sanford (1868-1941)
- Skinnell, Robert Garson (1949-)
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- Skinner, Ernest H.
- Skinner, Ernest Martin (1866-)
- Skinner, Graeme A. J. (1960-)
- Skinner Organ Co.
- Skoczylas, Lech (1956-)
- Skolaude, Walter (1919-1989)
- Sköld, Bengt Göran (1936-)
- Sköld, Karl Yngve (1899-1992)
- Skop, Vaclav Felix (1848-1932)
- Skottner, Finn (1907-1983)
- Skøyeneie, Stein (1961-)
- Škroup, Dominik Josef (1766-1830)
- Skuherský, František Zdeněk Xavier Alois (1830-1892)
- Skyrrowe, John
- Slack, Roy (1912-)
- Slageren, Pieter (1917-)
- Slagman, Dick (1976-)
- Slangen, Johannes Wilhelmus Maria (1951-)
- Slater, Doctor Albert (1878-)
- Slater, Edmund
- Slater, Dr Ernest (1860-)
- Slater, Dr Gordon Archbold (1896-1979)
- Slater, Herbert (1879-)
- Slater, James Frederick (1856-)
- Slater & Son, Robert
- Slatter, Arthur Malins (1879-)
- Slaughter
- Slavensky, Josip Štolcar (1896-1955)
- Slavický, Klement (1910-1999)
- Slavický, Milan (1947-2009)
- Slaymaker, Rowland K. (c1883-)
- Sleech
- Slettenhaar, Hennie (1931-)
- Slettholm, Yngve (1955-)
- Slinn, Edgar Beck
- Sloane, Dr Edward Joseph (1873-)
- Sløgedal, Bjarne (1927-)
- Sloman, Dr Robert (c1831-1895)
- Slonimsky, Sergei Mikhailovich (Сергей Михайлович) (1932-)
- Sloten, Karel van den (1848-1930)
- Sluka, Luboš (1928-)
- Slunicko, Johann (1852-1923)
- Slyck, Nicholas van (1922-1983)
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Organist 
Organist & composer 
Composer 
Organ builder 
Other
