Sergey Viktorovich Chemezov (Russian: Сергей Викторович Че́мезов; born 20 August 1952) is the CEO of Rostec Corporation, a state-owned defense conglomerate.

The Pandora Papers leaks revealed that Chemezov and his family maintained a large network of offshore wealth, including a $600 million superyacht.

[4] Chemezov graduated with honours from Irkutsk Institute of National Economy (presently Baikal State University of Economics and Law)[5] in 1975 and then completed his postgraduate education at the Military Academy of the General Staff of the Armed Forces of Russia.

[4][7] From 1983 to 1988, Chemezov served as the head[8] of the Luch Association representative office in East Germany, where he met Vladimir Putin and Nikolay Tokarev.

[24] On 26 November 2007, Putin appointed by decree Chemezov as CEO of Russian Technologies Corporation,[25][26] which was renamed Rostec in late 2012.

[30] The same day, Chemerov was mentioned in a communiqué of the US Treasury because the firm he directs was subjected to sanctions as part of a sweeping ban on the Russian defence sector.

[33] In February 2019, the Alexei Navalny linked Anti-Corruption Foundation discovered Chemezov's wife's Ekaterina Ignatova's apartment in the building located at the former site of the Moskva Hotel with a market value of about 5 billion rubles.

[34] On 3 March 2022, the United States imposed visa restrictions and froze assets of Chemezov, his wife, sons, stepdaughter due to the 2022 Russian invasion of Ukraine.

Ignatova is also the majority shareholder (along with Gor Nahapetyan, the managing director of Troika Dialog) of Étage, a chain of nineteen restaurants in Moscow.