The FAB 5000NG (Russian: ФАБ-5000НГ, where NG stands for its inventor, Nison Ilicz Gelperin) was a 5,000 kilogram (11,000 lb) large air-dropped, thin cased, high explosive demolition bomb used by the Soviet Air Forces during World War II.

[2] By 1942, the State Defense Committee of the Soviet Union perceived the need for weapons that could hit hard industrial and military facilities, marshaling yards and fortifications, without the usual scattering of medium-weight bombs.

[2] The Directorate of Logistics of the Air Forces eventually requested to Gelperin the development of a five-ton bomb, capable of being dropped by the Pe-8, the heaviest Soviet bomber of the time.

[2] The definitive version of the FAB-5000 was fitted with six contact lateral fuses, and the warhead was filled with 3200 kg (7055 lb) of an explosive mixture of TNT, RDX, and aluminium powder.

[3] On 19 July 1943, during the battle of Kursk, two Pe-8 dropped two bombs on a railroad yard near Orel,[3] ripping apart a 100 m section of the railway and obliterating dozens of railcars and German military vehicles.

[3] Soviet sources also claim that two buildings occupied by the Gestapo and the Belarusian Auxiliary Police were demolished by two FAB-5000 bombs at the city of Mogilev, Belarus,[4] apparently on 26 May 1943.