Sherwin John Carlquist FMLS (July 7, 1930 - December 1, 2021) was an American botanist and photographer.

During his graduate studies, Marion Elizabeth Stilwell Cave instructed him in the nuances of plant microphotography and embryology.

After his postdoctoral studies, he began his teaching career at the Claremont Graduate School.

From 1984 to 1992 Carlquist was the resident Plant Anatomist at Rancho Santa Ana Botanic Garden.

His last post was as an adjunct professor at University of California at Santa Barbara from 1993 to 1998.