Sergei Martynov
Sergei Martynov or Sergey Martynov may refer to:
- Sergey Martynov (archer), Kazakh archer
- Sergei Martynov (politician), former Belarusian Minister for Foreign Affairs
- Sergey Martynov (politician), Russian senator
- Sergei Martynov (serial killer), Russian serial killer accused of killing nine women between 1992 and 2010
- Sergei Martynov (sport shooter), Belarusian rifle shooter
- Sergey Martynov (wrestler), Russian Greco-Roman wrestler