Iran Supreme Leader: Role, Powers, and Succession Explained

When people discuss who truly holds power in Iran, the conversation quickly moves past the president. The real authority lies with the Supreme Leader, a position that commands the military, the judiciary, and the media. This article explains the role of Iran’s Supreme Leader — currently Ali Khamenei — and examines the succession process after his death in March 2026, when Mojtaba Khamenei was designated as his successor, according to Reuters (wire service).

Current Supreme Leader: Ali Khamenei (since 1989) · Previous Supreme Leader: Ruhollah Khomeini (1979–1989) · Successor Designated (2026): Mojtaba Khamenei · Number of Supreme Leaders in Iran’s history: 3

Five key facts define the Supreme Leader’s role, from name to designated successor.

Who is next after Ali Khamenei?

Mojtaba Khamenei as successor

• Mojtaba Khamenei, the son of Ali Khamenei, was chosen as successor in March 2026 after Ali Khamenei was killed in US-Israeli strikes, according to Reuters.
• He is a senior cleric and has long been considered a behind-the-scenes power broker within Iran’s political system, as noted by CNN.

Timeline of succession after Khamenei’s death

• Immediately after Khamenei’s death, a temporary Leadership Council — composed of the president, the judiciary chief, and a senior cleric — assumed the Supreme Leader’s duties, as reported by TRT World Research Centre.
• The Assembly of Experts, an elected body of 88 senior clerics, must choose a permanent successor as soon as possible under Iranian law, explained ABC7 Chicago.

The succession process remains fluid, with the Assembly of Experts holding the final say.

Who is stronger in Iran, president or supreme leader?

Six areas of authority — one clear pattern: the Supreme Leader outranks the president in every domain that matters for regime survival.

The pattern: The president manages the executive branch; the Supreme Leader controls the system’s levers of power. As FIU News notes, the Supreme Leader is the highest religious and political authority and serves for life.

How powerful is Ali Khamenei?

Scope of Khamenei’s authority

• Khamenei has ultimate control over Iran’s nuclear program and foreign policy, as detailed by CFR (Council on Foreign Relations, think tank).
• He appoints the heads of the judiciary, the military (including the IRGC), and state media (Encyclopaedia Britannica).
• He can dismiss the president if the Supreme Court or parliament finds the president unfit, though this has never happened.

Influence over foreign policy and military

• Khamenei directly oversees the Islamic Revolutionary Guard Corps (IRGC) and its Quds Force, which operate in Iraq, Syria, and Yemen (PBS FRONTLINE).
• The Guardian Council, half of whose members he appoints, can veto any legislation that contradicts Islamic law, effectively blocking policies he opposes (Encyclopaedia Britannica).

Relationship with other branches of government

• The judiciary is entirely under his appointee, the judiciary chief.
• The president must seek Khamenei’s approval for key cabinet positions and international agreements.

Khamenei’s death has created a power vacuum that tests the durability of his institutional control.

Is Ayatollah Khomeini dead?

Date and cause of Khomeini’s death

• Ruhollah Khomeini died on June 3, 1989, after a heart attack (Encyclopaedia Britannica).
• He was 89 years old.

Khomeini’s role as first Supreme Leader

• Khomeini was the founder of the Islamic Republic of Iran and its first Supreme Leader, serving from 1979 until his death (Wikipedia).
• He established the concept of velayat-e faqih (guardianship of the jurist), which gives the Supreme Leader absolute authority over the state.

Khomeini’s legacy continues to shape Iran’s political and religious identity.

Who is Iran’s biggest ally?

Key allies of Iran

• Iran’s closest ally is Syria — the Assad government is a critical partner in the “Axis of Resistance” (CFR).
• Russia and China are major strategic partners, providing diplomatic cover at the UN and economic cooperation (CFR).
• Hezbollah in Lebanon is Iran’s most important non-state ally, receiving extensive financial and military support (PBS FRONTLINE).

The implication: Iran’s alliances are defined by opposition to Israel and the United States, and by mutual interests with Russia and China.

Timeline of Supreme Leadership

• 1979 — Islamic Revolution; Khomeini becomes first Supreme Leader (Wikipedia)
• June 3, 1989 — Death of Ruhollah Khomeini (Encyclopaedia Britannica)
• June 4, 1989 — Ali Khamenei appointed Supreme Leader (Encyclopaedia Britannica)
• March 2026 — Ali Khamenei killed in US-Israeli strikes; Mojtaba Khamenei chosen as successor (Reuters)

The 2026 transition marks a critical juncture in Iran’s post-revolutionary history.

What we know and what remains uncertain

Confirmed facts

• Ali Khamenei is the current Supreme Leader (Encyclopaedia Britannica)
• Ruhollah Khomeini died in 1989 (Encyclopaedia Britannica)
• Mojtaba Khamenei was designated successor in March 2026 (Reuters)

What’s unclear

• Exact date of Mojtaba Khamenei’s formal assumption of power (CNN)
• Full details of the succession process after Khamenei’s death (ABC7 Chicago)
• Whether the Assembly of Experts will formally confirm Mojtaba Khamenei as permanent successor (CNN)

“Mojtaba Khamenei was chosen as successor after his father’s killing, according to a statement from the Assembly of Experts.”

— CNN news report

“The Supreme Leader is the highest religious and political authority in the Islamic Republic and serves for life.”

— FIU News, citing political scientist

For the Assembly of Experts, the choice is clear: approve Mojtaba Khamenei and preserve the regime’s stability, or face a power struggle that could fracture the Islamic Republic.

For readers seeking a more detailed analysis, a comprehensive breakdown of the Supreme Leaders powers is available that traces the evolution of this office since the 1979 revolution.

Frequently asked questions

Related reading

• Joseph Stalin: Biography, WWII Leadership, Death & Legacy — Compare another supreme leader’s consolidation of power.
• King George III: Madness, Illness & Historical Facts — Examine a monarchical system with limited constitutional checks.