August Christian Heinrich Niemann (30 January 1761 – 21 May 1832) was a German forestry engineer and political economist.
Serving as Hofmeister for a fellow student of noble background, he moved to the University of Göttingen in 1782.
Niemann became extraordinary professor at Kiel University, director of the newly formed forestry institute, in 1787.
He was made ordinary professor in 1794, and he served as rector of Kiel University in the academic years 1811/12 and 1829/30.
Niemann was active co-founder of a charitable organisation supporting the poor, the Gesellschaft freiwilliger Armenfreunde.