Pavel Savelyev (1929– ?) – Candidate of Technical Sciences, Docent of  the Riga Technical University. >>

Yevgenia Schwartz (1929-2012) – Professor, Habilitated Doctor of Chemistry (Dr. habil. chem.), specialist of the field of Borium chemistry and its compounds. >>

Gilel Segal (1931–2003) – professor, hydraulic engineer, habilitated doctor of engineering sciences (Dr. habil. sc. ing.), academician of the Latvian Academy of Agricultural and Forestry Sciences. >>

Lidia Semyonova (1925–2015) – Docent of the Chair of Material Engineering of the Riga Polytechnic Institute from 1968 to 1990. >>

Maria Semyonova (1910–1988) – Docent of the Faculty of Philology of the Latvian State University, Candidate of Philological Sciences. Specialist in the field of dialectology and comparative grammar of the Russian and Latvian languages. >>

Varvara Sergeyeva (1902–1997) – a Full Member of the Latvian SSR Academy of Sciences, prominent expert in the chemistry of wood. >>

Ludmila Sergeyeva (1941) – Doctor of Engineering (Dr. sc. ing.), associate professor of the Riga Technical University. >>

 Nikolay Sevastyanov (1919–1994) – Doctor of Technical sciences, professor, an expert in the field of aeronautical automatics and computer technology. >>

Vladimir Shestakov (1938) – Professor, Habilitated Doctor of Engineering (Dr. habil. sc. ing.), specialist in the field of aviation machinery, history of aviation in Latvia. >>

Stephen (Stepan) Shimansky (1867-1931) – professor of technological chemistry of Riga Polytechnical Institute, eminent specialist of the field of the technology of paints, Director of the Riga Russian Technical College >>