Selcuk is typically a diacritic-free form of Turkish Selçuk, the modern Turkish form of Seljuk or Seljuq.
As such, it may refer to:
- Selçuk (name)
- Selçuk, a town in Turkey
- 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
- Selcuk, a freighter, ex-Dalwarnic