Selcuk may refer to:

• Selçuk (name)
• Seljuk (died c. 1038), leader of the Seljuk Turks
  • Seljuq dynasty, the dynasty founded by Seljuk
  • Seljuq Empire, the medieval empire founded and ruled by the dynasty
  • Seljuq Sultanate of Rum, the medieval empire founded by later members of the dynasty
• Selçuk, a town in Turkey
• Selcuk (ship, 1921), a freighter, see Dalwarnic

Selçuk is the central town of Selçuk district, Izmir Province in Turkey, northeast of the ancient city of Ephesus.