Sergey Alexandrovich Kirdyapkin (, born 18 June 1980 in Insar, Mordovia) is a Russian race walker. He was stripped of the 2012 Olympic gold medal in the 50K walk, by decision of the Court of Arbitration published 24 March 2016, due to doping violations. Due to these doping violations, he was given a three-year-and-two-month ban from athletic competition, backdated to 15 October 2012, allowing him time to still qualify for the 2016 Summer Olympics. However, Russia did not compete in athletics at the 2016 Olympics, due to the suspension of the governing body, the IAAF, due to widespread doping.