Sergey Aleksandrovich Teteryatnikov (Russian: áõÃÂóõù ÃÂûõúÃÂðýôÃÂþòøàâõÃÂõÃÂÃÂÃÂýøúþò; born 19 December 1988) is a Russian cosmonaut candidate.
Teteryatnikov graduated from the Naval Engineering Institute.
Prior to his selection as a cosmonaut candidate, Teteryatnikov worked on the operation of submarines.
In January 2021, Teteryatnikov was selected as one of four cosmonaut candidates by Roscosmos from an open recruitment process that began in 2019. The other selectees were Sergey Irtuganov, Alexander Kolyabin, and Harutyun Kiviryan.
He began general space training at the Yuri Gagarin Cosmonaut Training Center.
As of 2025, Teteryatnikov remains a cosmonaut candidate and has not yet flown in space. He is however the back-up Russian cosmonaut for SpaceX Crew-12, which should lead him to a mission assignment.