April 1
Iran Becomes an Islamic Republic
Ayatollah Ruhollah Khomeini proclaimed Iran an Islamic republic on April 1 after voters overwhelmingly endorsed the change in a national referendum.
Summary
Following the 1979 Iranian Revolution that ousted the monarchy, Ayatollah Ruhollah Khomeini emerged as the dominant figure in the new revolutionary government. A national referendum was held to determine the country's political system amid competing visions among revolutionary factions. On April 1, 1979, Khomeini formally declared Iran an Islamic republic after the referendum showed overwhelming support. The declaration ended the Pahlavi dynasty and established a theocratic framework under the doctrine of velayat-e faqih, or guardianship of the Islamic jurist. It consolidated clerical authority over state institutions and foreign policy. The move marked the culmination of the revolution's transformation from a broad anti-monarchy coalition into an explicitly Islamic state.
Context
The 1979 Iranian Revolution grew out of mounting opposition to Shah Mohammad Reza Pahlavi’s rule. Decades of rapid modernization, close ties to the United States, and suppression of political dissent had alienated religious leaders, merchants, students, and large segments of the urban population. Ayatollah Ruhollah Khomeini, living in exile since 1964, became the revolution’s most prominent voice by framing the struggle in explicitly Islamic terms while still attracting support from secular and leftist groups.
What Happened
After the Shah departed Iran in mid-January 1979 and Khomeini returned to Tehran on February 1, the monarchy collapsed within days when the armed forces declared neutrality. An interim government headed by Mehdi Bazargan took office, yet real authority lay with revolutionary committees and Khomeini’s clerical network. In late March, officials organized a simple yes-or-no referendum on establishing an Islamic republic. Voting took place March 30–31 across most of the country, producing official tallies of roughly 97–98 percent approval amid high turnout.
Aftermath
Khomeini’s April 1 declaration formalized the end of the Pahlavi dynasty and the start of a new political order. Drafting of a constitution that placed supreme authority in the hands of a religious jurist began soon afterward, while competing revolutionary factions found themselves increasingly sidelined.
Legacy
The April 1 proclamation entrenched a hybrid system of republican institutions overseen by clerical guardians that has defined Iranian governance ever since. It also projected a model of Islamic revolution that influenced movements across the Middle East and prompted decades of regional rivalry and international sanctions.
Why It Matters
The declaration institutionalized the Islamic Republic's unique blend of republican and theocratic governance, influencing Iran's domestic politics and regional relations for decades. It exported revolutionary ideology and shaped conflicts across the Middle East. The system has endured as a model for other Islamist movements while facing internal and external challenges.
Related Questions
What question appeared on the referendum ballot?
Voters were asked simply whether they approved of an Islamic republic; no other options were offered.
How high was voter turnout in the referendum?
Official figures reported turnout near 98 percent of eligible voters, though participation was lower in some minority regions.
Who formed the interim government after the Shah’s departure?
Mehdi Bazargan headed a provisional administration appointed by Khomeini until power struggles led to his resignation later in 1979.
What happened to the draft constitution after April 1?
A new constitution was approved in December 1979 that institutionalized clerical supremacy under the doctrine of velayat-e faqih.
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Sources
- Following overwhelming support in a national referendum, Ruhollah Khomeini declared Iran an Islamic republic, Encyclopædia Britannica. Accessed 2026-07-09.