Caspian can refer to:

• The Caspian Sea
• The Caspian Depression, surrounding the northern part of the Caspian Sea
• The Caspians, the ancient people living near the Caspian Sea
• The Caspian languages spoken in northern Iran and southeastern Azerbaijan
• The Northeast Caucasian languages, also referred to as 'Caspian languages,' spoken in the Russian Caucasus and northern Azerbaijan

In fiction

• Prince Caspian, a book in the Chronicles of Narnia series by C. S. Lewis
  • Caspian X, "Prince Caspian", a prince of the Telmarines
  • The Chronicles of Narnia: Prince Caspian, a film based on the novel by C. S. Lewis
• Caspian (Highlander), a fictional character on Highlander: The Series
• Judson Caspian, alter-ego of one of three characters named the Reaper (DC Comics)

Other uses

• Caspian horse, a small horse breed native to Northern Iran
• Caspian tiger, a Panthera tigris population native Northern Iran and Caucasus
• Caspian Airlines, an airline based in Tehran, Iran
• Caspian (band), an instrumental post-rock band
• Caspian, Michigan, a small city in the United States
• USS Caspian (ID-1380), proposed designation for a tug that never actually served in the United States Navy