Gali Sabardina (1914–1973) – a geobotanist, Doctor of Biology Sciences, correspondent member of Latvian Academy of Science (1968), Deputy Director of the Institute of Biology of the Academy of Sciences of the Latvian SSR (1951–1973). >>

Irina Saburova (1907–1979) – writer. Wrote the novel «Ships of the Old Town»; the only fiction work of «Russian Riga». >>

Vladimir Sadikov (1874–1942) – a biochemist, scientific collaborator of resort Kemeri (Riga Seaside), later professor of the Leningrad State University. >>

Firs Sadovnikov (1789–1853) – a merchant of the 1st guild, donor. >>

Gennady Sagalovich (1936–2015) – Habilitated Doctor of Engineering (Dr. habil. sc. ing.), Professor of the Riga Technical University. >>

Sergey Sakharov (1880–1954) – a teacher, historian of the Russian Orthodox Church, ethnographer, publicist. >>

Alla  Sakharova (1951) – a ballerina, classical dance teacher, theater scholar. >>

Alexander Sallak (1885– ?) –  a teacher of History and Russian, Deputy Head of the Russian department of the Ministry of Education of the Republic of Latvia from 1920 to 1934. >>

Yevgeny Sallinen (1954–2009) – Doctor of Maths, Docent of the Chair of Higher mathematics of the Riga Technical University. >>

Margarita Saltupe (neé Morozova; 1917–2006) – a physician, popularizer of the artist Eugene Klimoff's (1901–1990) creativity >>