Friedrich Adam Julius von Wangenheim (8 February 1749 Sonneborn – 25 March 1800 Gumbinnen) was a German botanist specializing in forestry, and was the citing authority for a number of described eastern North American plant species.

He was also a Hessian soldier, and during his service in the Thirteen Colonies devoted his leisure time to botanical studies of American forests.

When he returned to Prussia, he wrote up his research and strongly advocated importing suitable American species of trees and shrubs for use in German forests.

He went to the United States in 1777 in the Hessian contingent in the British service, served with the Hesse-Kassel Feld Jaegerkorps in New York and Pennsylvania 1778-1783, and won a commendable reputation.

On request of the academy, he was then sent to Gumbinnen as director general of the waters and forests of eastern Prussia, where he carried on experiments on a large scale and planted a great number of American trees.