The Shah Mosque (Persian: مسجد شاه), also known as Royal Mosque or Imam Mosque[1] after Iranian revolution, is a mosque in Isfahan, Iran, standing in south side of Naghsh-e Jahan Square. Built during the Safavid Empire, ordered by Abbas I of Persia.

View of the Mosque from Naqsh-e Jahan Square
It is regarded as one of the masterpieces of Persian architecture in the Islamic era. The Royal Mosque is registered, along with the Naghsh-e Jahan Square, as a UNESCO World Heritage Site.[2] Its construction began in 1611, and its splendor is mainly due to the beauty of its seven-colour mosaic tiles and calligraphic inscriptions.