Sergey Viktorovich Chemezov (born August 20, 1952, Cheremkhovo, Soviet Union) is CEO of Rostec Corporation (formerly the Director General of Rosoboronexport), chairman of the Union of Russian Mechanical Engineers, and a lieutenant-general.

Graduated with honors from Irkutsk Institute of National Economy (presently Baikal State University of Economics and Law) in 1975 and then completed his postgraduate education at the Military Academy of the General Staff of the Armed Forces of Russia. Sergey Chemezov has a doctorate in economics and is also a professor and full member of the Military Academy. 

By a decree of the Russian President, on November 26, 2007, Sergey Chemezov was named CEO of Russian Technologies Corporation, which was renamed Rostec in late 2012. At the 6th United Russia party convention held on December 2, 2006, Sergey Chemezov was elected to the party’s Supreme Council. At the 7th party convention on May 26, 2012, Cheremezov was reelected.

On April 28, 2014 he was barred by the Obama administration from entering United States.