Count Karl Ivanovich Opperman (12 November 1766, Darmstadt - 2 July 1831, Vyborg) was a German-born engineer, surveyor, army officer and fortification builder in the service of the Imperial Russian Army. He fought in the Napoleonic Wars and was a member of the State Council, Director of the Engineering and Building Department, Head of the Engineering and Artillery School and the school guard sub-ensigns and cavalry cadets, director of the maps and the hydrographic depot and an honorary member of the Imperial Academy of Sciences.