Johan Georg Ludvig Manthey (3 June 1769 - 18 January 1842) was a Danish pharmacist. He owned the Lion Pharmacy in Copenhagen from 1791 to 1805, managed Ørholm and Brede Works from 1805 to 1811 and served as director of the Royal Copenhagen Porcelain Manufactory from 1796 to 1812. He lived on the Falkensteen estate at Slagelse from 1812.