The Shah Mosque also known as New Abbasi Mosque (Masjed-e Jadid-e Abbasi), Royal Mosque, or Imam Mosque after the Iranian Revolution, is a mosque in Isfahan, Iran, standing in south side of Naghsh-e Jahan Square. It was built during the Safavid dynasty, ordered by Abbas I of Persia. 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.