The Expediency Discernment Council of the System (Persian: مجمع تشخیص مصلحت نظام Majma'-e Taškhīs-e Maslahat-e Nezām) is an administrative assembly appointed by the Supreme Leader and was created upon the revision to the Constitution of the Islamic Republic of Iran on 6 February 1988. It was originally set up to resolve differences or conflicts between the Majlis and the Guardian Council, but "its true power lies more in its advisory role to the Supreme Leader." According to Hooman Majd, the Leader "delegated some of his own authority to the council—granting it supervisory powers over all branches of the government" following President Mahmoud Ahmadinejad's election in 2005.

Members of the council are chosen by the Supreme Leader every five years.