Nahum Isaakovich Eitingon (Russian: ???? ????????? ???????? Naum Isaakovic Ejtingon, Hebrew: ???? ?????????), also known as Leonid Aleksandrovich Eitingon (Russian: ?????? ????????????? ????????) (6 December 1899, Shklou, Mogilev Governorate – 3 May 1981, Moscow), was a Soviet intelligence officer, who has been described by Yevgeny Kiselyov as one of the organisers and managers of the state terrorism system under Joseph Stalin and later a victim thereof.