Scientific Illustration: Botany:
 Schaffer, Julius (1882 - 1944)
About Julius Schaffer
 Schagen, Pieter (fl. 1637)
The Tulip Book of P. Cos
 Schmidt, C. F. (fl. ca. 1887)
 Sinclair, Isabella (fl. 1885)
Biographical:
Illustrated Indigenous Flowers of Hawaiian Islands (1887).
 Smith, E. D.

Snelling, Lilian (1879-1972)
Biographical:
Principal artist for Curtis's Botanical Magazine for 30 years.
 Solt, Marie L.
(1925 - 1978)
 Sprague, Isaac
Biographical:
In 1843, Sprague joined John James Audubon's expedition on the Missouri River. Illustrated Asa Gray's Botanical Textbook and Flora. Worked with John Torrey and Henry Henshaw.
 Switzer, A. (fl. 1629)
Biographical:
Illustrated Paradisi In Sole Paradisus Terrestris (1629).

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