Sergey Nikolayevich Ryzhikov (Russian: ?????? ?????????? ???????; born on August 19, 1974), lieutenant colonel of Russian Air Force, is a Russian cosmonaut, selected in 2006.
Ryzhikov launched on his first spaceflight onboard the Soyuz MS-02 spacecraft.
He spent approximately six months onboard the International Space Station taking part in Expedition 49/50, returning to Earth on April 10, 2017.