Kirill Ivanovich Shchelkin (Russian: ?????? ???????? ??????) (17 May 1911 – 8 November 1968) was a Soviet Georgian physicist known for his theoretical and experimental advances in combustion and gas dynamics, for his work on the first Soviet nuclear and thermonuclear weapons, and for his role as the first scientific director of the Soviet nuclear weapons development centre in the Urals at Chelyabinsk-70 and deputy scientific director of the Soviet atomic bomb project.