Johann Heinrich Blasius (7 October 1809 – 26 May 1870) was a German zoologist. His son, August Wilhelm Heinrich Blasius (1845–1912), was an ornithologist.
In 1836, he was appointed as a professor at the Collegium Carolinum in Braunschweig. In 1840, he founded the Botanischer Garten der Technischen Universität Braunschweig. In 1859 he was appointed as the director of the newly founded Naturhistorisches Museum (Braunschweig) and in 1866 also of the Herzog Anton Ulrich Museum.