Dagestan or Daghestan may refer to:

• Republic of Dagestan, a federal subject of Russia
• Dagestan Autonomous Soviet Socialist Republic (1921–1993), an administrative division of the Russian SFSR, Soviet Union
• Dagestan Oblast (1860-1917), province of the Russian Empire
• Safavid Daghestan, a province of the Safavid Empire of Iran
• 2297 Daghestan, asteroid
• Dagestan, a Gepard-class frigate laid down in 1994 and currently active in the Russian Caspian Sea fleet.