- Smitt, Christina (1960-)
- Smoke, Gary R. (1956-)
- Smolanoff, Michael Louis (1942-)
- Smolik, Otomar (1835-1898)
- Smolka, Jaroslav (1933-)
- Smyth, Charles Frederick
- Smyth, Edward
- Smyth, Dame Ethel Mary (1858-1944)
- Smyth, Thomas
- Smyth, William
- Smyth, William
- Smythe, Thomas
- Snell, Arthur (1886-)
- Snetzler, John (Johann) (1710-1785)
- Snízková-Skrhová, Jitka (1924-1989)
- Snow, Albert W. (1878-)
- Snow, Dr Francis Warren (1891-1961)
- Snow, Herbert
- Snowdon, William Lockhart (1906-)
- Snowhill, George (1911-1973)
- Snyder, Randall (1944-)
- Snyers, Félix (1940-)
- Soames, René (1903-)
- Soar, Dr Joseph (1878-)
- Sobey, Edwin Albert (1871-1953)
- Söderberg, Hans (1937-)
- Söderholm, Valdemar (1909-1990)
- Soderini, Agostino
- Söderlind, Ragnar (1945-)
- Söderlundh, Bror Axel (1912-1957)
- Söderman, Johan August (1832-1876)
- Soderno, Agostino
- Södersten, Gunno (1920-1998)
- Sofianopulo, Marco (1952-)
- Söhner, Leo Paul (1898-1957)
- Söhnge, Wilhelm Ernst Heinrich (1909-)
- Sohnle, Wilhelm
- Sointula, Wiktor Johannes (1904-)
- Sokola, Miloš (1913-1976)
- Sokolov, Boris W. (Борис Михайлович) (1944-)
- Sokulski, Antoni (1771-1855)
- Sola, Andrés de (1634-1696)
- Solazzo, Francesco (1946-)
- Solberg, Leif (1914-)
- Solbiati, Alessandro (1956-)
- Soler-Ramos, Padre Antonio Francisco Javier José (1729-1783)
- Soler y Sardá, Josep (1935-)
- Solly, T. Edwin
- Solomons, David Warin (1953-)
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- Soltys, Mieczyplaw (1869-1929)
- Somers-Cocks, John Patrick (1907-1995)
- Somerton, Walter (1858-1925)
- Somervell, Sir Arthur (1863-1937)
- Somerville, William Charles (1876-1931)
- Somes, George Francis (1890-)
- Somma, Bonaventura (1893-1960)
- Sommerfeldt, Øistein (1919-1994)
- Sommerville, Thomas (1916-1997)
- Soncino, Emmanuel
- Sönke, Horst (1929-)
- Sonnenburg, Klaus (1927-2008)
- Sonntag, Brunhilde (1936-2002)
- Sønstevold, Gunnar Johannes (1912-1991)
- Soper, S. H.
- Soproni, József (1930-)
- Sorabji, Leon Dudley (Kaikhosru Shapurji) (1892-1988)
- Sorelli, Angelo (1922-)
- Sørensen, Bent (1958-)
- Sørensen, Søren Ole (1920-2001)
- Sörenson, Torsten Napolean (1908-1992)
- Soresby, Roger William (1877-1923)
- Soresina, Alberto (1911-2007)
- Sorge, Erich Robert (1933-)
- Sorge, George Andreas (1703-1778)
- Sorokin, Konstantin Stepanovich (Константин) (1909-)
- Sorrell, William
- Sosnowski, Česlovas (1867-1916)
- Sothurn, George
- Soto, Francisco de (c1500-1563)
- Soursby, John
- Sousa, Charles de (c1865-)
- Souster, Timothy Andrew James (1943-1994)
- Soutar, Alexander Anderson (1913-)
- South, Charles Frederick (1850-1916)
- Southall, Charles Bertram (1873-1961)
- Southall, John
- Southan, Arthur Richard C. (1878-1932)
- Southard, Lucien H. (1827-1881)
- Southbridge, James
- Southgate, Bernard Henry (1884-c1956)
- Southgate, Cuthbert James (1904-)
- Southgate, Thomas Lea (1836-1917)
- Southick, Thomas
- South Island Organ Co.
- Southwell, Wilfred Locksley (1900-)
- Southwick, Frank Treat (-1948)
- Souza, Jose Geraldo de (1913-)
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Organist 
Organist & composer 
Composer 
Organ builder 
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