Sergei Martynov

Sergei Martynov or Sergey Martynov may refer to:


 * Sergey Martynov (archer) (born 1965), Kazakh archer
 * Sergei Martynov (politician) (born 1953), former Belarusian Minister for Foreign Affairs
 * Sergey Martynov (politician) (born 1959), Russian senator
 * Sergei Martynov (serial killer) (born 1962), Russian serial killer accused of killing nine women between 1992 and 2010
 * Sergei Martynov (sport shooter) (born 1968), Belarusian rifle shooter
 * Sergey Martynov (wrestler) (1971–1997), Russian Greco-Roman wrestler