Konstantin Fyodorovich Chelpan (Russian: Челпан, Константин Фёдорович) (27 May 1899 – 10 March 1938) was a prominent Soviet engineer of Greek background. Head of the Engineering Design Bureau of the Kharkiv Locomotive Factory, chief designer of the T-34 tank engine. Awarded the Order of Lenin. Politically repressed and executed under a mass persecution ordered by Joseph Stalin. Politically rehabilitated after death.