S
- Joseph Sabine
- Julius von Sachs
- Augustin Saint-Hilaire
- Edward James Salisbury
- Richard Anthony Salisbury
- Charles Sprague Sargent
- William Saunders
- Horace-Bénédict de Saussure
- Andreas Franz Wilhelm Schimper
- Diederich Franz Leonhard von Schlechtendal
- Rudolf Schlechter
- Matthias Jakob Schleiden
- George Schoener
- Selmar Schonland
- Heinrich Wilhelm Schott
- Franz Paula von Schrank
- Georg August Schweinfurth
- Giovanni Antonio Scopoli
- Berthold Carl Seemann
- Prideaux John Selby
- Jean Senebier
- Martín Sessé y Lacasta
- John Adolph Shafer
- George Shaw
- Shen Kuo
- John Sibthorp
- Franz Sieber
- Philipp Franz von Siebold
- Thomas Robertson Sim
- John Kunkel Small
- Christo Albertyn Smith
- James Edward Smith
- Johannes Jacobus Smith
- Daniel Solander
- Otto Wilhelm Sonder
- Pierre Sonnerat
- Roger David Spencer
- Herman Spoering
- Kurt Sprengel
- Richard Spruce
- Herman Spöring
- Agustín Stahl
- Paul Carpenter Standley
- G. Ledyard Stebbins
- Georg Wilhelm Steller
- Kaspar Maria von Sternberg
- Julian Alfred Steyermark
- Eduard Strasburger
- George Bishop Sudworth
- Su Song
- Olof Swartz
- Simon Syrenius
Read more about this topic: List Of Botanists