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- Sigismund von Schlichting – 19th century infantry theorist
- Sebastien le Prestre de Vauban
- Thomas Schelling
- Richard Simpkin – military theorist
- Vasily Sokolovsky
- Hew Strachan – military historian
- Sun Bin – claimed descent from Sun Tzu, and was considered Sun Tzu II, Sun Bin Bing Fa
- Sun Tzu – general, The Art of War
- Alexander Suvorov – general, The Science of Victory
Read more about this topic: List Of Military Writers