Sergey Vasilyevich Bakulin (Russian: Серге́й Васильевич Бакулин; born 13 November 1986 in Insar, Mordvin ASSR) is a male race walker from Russia.

He was advanced to 5th place when teammate Igor Yerokhin was disqualified and banned for life following a second finding of irregularities in his biological passport, an indicator of performance-enhancing drugs.

Bakulin began serving a previously unannounced suspension for irregularities in his biological passport beginning in December 2012.

[2] Suspicions that he had been suspended began when Bakulin failed to defend his World Championship title on home soil, even though he was given a bye to do so.

[4] On 25 March 2015, the IAAF filed an appeal with the Court of Arbitration in Lausanne, Switzerland, questioning the selective suspension periods of the six athletes involved including the window that opened up less than a month before his World Championship gold medal.