Henry Kraemer (July 22, 1868 – September 9, 1924) was an American professor of pharmacy who specialized in pharmacognosy and wrote several pioneering textbooks on the subject.

In 1895 he obtained a bachelor of philosophy degree from the School of Mines, Columbia University and went to Germany where he received a Ph.D. from the University of Marburg under Arthur Mayer with a dissertation on Viola tricolor titled "Viola tricolor L. in morphologischer, anatomischer und biologischer Beziehung".

He examined plant products in collaboration with the Michigan Botanical Gardens and ran correspondence courses.

His biggest contribution was A Text-book of Botany and Pharmacognosy which was first published in 1902 with three editions running to 1910.

In 1915 he wrote Scientific and Applied Pharmacognosy, Intended for the Use of Students in Pharmacy and Practicing Pharmacists, Food and Drug Analysts and Pharmacologists.