A constitutional referendum was held in Iran on 28 July 1989, alongside presidential elections.

Approved by 97.6% of voters,[1] it was the first and so far only time the Constitution of the Islamic Republic of Iran has been amended.

On 24 April 1989 while on his deathbed, Ayatollah Khomeini appointed a 25-man "Council for the Revision of the Constitution" (Persian: شورای بازنگری قانون اساسی, romanized: Šurā-ye bāznegari-e qānun-e asāsi).

The council named Ali Khamenei as Khomeini's successor as Supreme Leader of Iran and drew up several amendments to the original constitution.

[3] Some changes to the constitution introduced by the Reform Council include: The amendments were allegedly approved by Iranian voters and became law on 28 July 1989.