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- Grégoire de Saint-Vincent, contributions to the theory of Logarithms
- Maciej Kazimierz Sarbiewski, Polish Latin poet of the Counter-Reformation, crowned poet laureate by Pope Urban VIII
- Johann Schreck, 17th-century German polymath and missionary to China
- Gaspar Schott, first published mention of the universal joint
- Angelo Secchi, astronomer
- Juan Luis Segundo, liberation theologian
- Thomas Ewing Sherman, son of U.S. Civil War General William T. Sherman
- Piotr Skarga, Polish priest, homilist, and hagiographer
- Pierre-Jean De Smet, American explorer and missionary
- Jan Mikołaj Smogulecki, introduced logarithms to China
- Jon Sobrino, Author of Christology at the Crossroads, liberation theologian
- Carlos Sommervogel, scholar and author of Bibliothèque de la Compagnie de Jésus
- Saint Robert Southwell, Elizabethan poet and martyr
- Cardinal Tomáš Špidlík, Czech theologian and professor
- Walter Steins, 19th-century Dutch bishop, Vicar Apostolic of Bombay and then Calcutta and 3rd Bishop of Auckland, New Zealand.
- Francisco Suárez, Scholastic philosopher
- Jón Sveinsson, Poet and writer from Iceland
- Ignacije Szentmartony, Croatian mathematician and astronomer
Read more about this topic: List Of Jesuits