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 >>

Dmitry Shirin (1932) – Candidate of Economic Sciences, Docent of the Riga Polytechnic Istitute (from 1990 – Riga Technical University). >>

Valentina Shislyannikova (1918-1979) – Candidate of Physics and Mathematics, Docent of the Riga Polytechnic Institute. >>

Alexander Shostak (1948–2024) – Latvian mathematician, professor and academician, a world-famous scientist. >>

Igor Shuvaev (1963–2024) – a philosopher, academician, scientist of European renown. >>

Leo Sidyakov (1932–2006) – professor, Pushkin scholar. >>

Yuri Sidyakov (1953) – Doctor of Philology, Associate Professor of the Slavic Department of the University of Latvia. >>

Igor Sikorsky (1889-1972)  –  a founder of Russian aircraft construction,  aircraft constructor in Russo-Balt, then became a distinguished American helicopter builder. >>