Gronovius is a surname. It is a latinised form of the surname Gronow. Notable people with the surname include:
Abraham Gronovius (1695-1775), Dutch classical scholar and librarian, son of Jakob Gronovius; Jakob Gronovius (1645–1716), Dutch classical scholar, son of Johann Friedrich Gronovius; Jan Frederik Gronovius (also Johannes Fredericus) (1686–1762), Dutch botanist, son of Jakob Gronovius; Johann Friedrich Gronovius (1611–1671), German classical scholar and critic; Laurens Theodorus Gronovius (1730–1777), Dutch botanist.
See also Gronovius (beetle), a genus of insects in the family Chrysomelidae Cuscuta gronovii, Gronovius' dodder