Boris Sergeyevich Stechkin (24 July 1891 – 2 April 1969) was a Russian and Soviet scientist, engineer and inventor.
He developed a theory of heat engines and was involved in construction of many Soviet aircraft engines.
He was also co-developer of Sikorsky Ilya Muromets (the first four-engine airplane and bomber, 1913) and Lebedenko's Tsar Tank (the largest armored vehicle in history, 1916–1917).
He died in Moscow on 2 April 1969.