Demidov is a Russian noble family.

Demidov may also refer to:

• Demidov (surname) or Demidova, a surname
• Demidov, Smolensk Oblast, a town and the administrative center of Demidovsky District of Smolensk Oblast, Russia
  • Demidov (inhabited locality), a list of inhabited localities named Demidov
• Demidov Bridge, a bridge in St. Petersburg, Russia
• Demidov Island, an island in Antarctica

• Demidov Prize, a national scientific prize in the Russian Empire