Who Owns Strait of Hormuz?

Nobody owns the Strait of Hormuz. The water is divided between the territorial seas of Iran and Oman, whose coastlines are close enough that the strait at its narrowest lies entirely within their waters. But sovereignty over the water does not include the right to close it: under the law of the sea, ships and aircraft have a right of transit passage that cannot be suspended. Verified 6 September 2026.

Who owns Strait of Hormuz?

The strait connects the Persian Gulf to the Gulf of Oman and the open sea. At its narrowest it is about 21 nautical miles — roughly 39 kilometres — across, with Iran on the northern shore and the Musandam peninsula, an exclave of Oman, on the southern.

Because a state’s territorial sea extends 12 nautical miles from its coast, the two states’ territorial waters meet in the middle. There is no strip of international water down the centre. Every ship passing through is in either Iranian or Omani waters at all times.

That is as close to ownership as the strait gets, and it is not ownership in any sense this site uses elsewhere. Nobody holds title to it, nobody can sell it, and the sovereignty each state has over its own waters is qualified by rights the rest of the world holds in them.

Ownership and control structure

The governing framework is the United Nations Convention on the Law of the Sea. For straits used for international navigation, it establishes transit passage: the right of all ships and aircraft to pass through in continuous and expeditious transit, which the coastal states may not suspend.

This is deliberately stronger than the ordinary right of innocent passage through territorial waters, which can be suspended temporarily and does not extend to aircraft or submerged submarines. Straits like Hormuz, Gibraltar and Malacca were given the stronger regime precisely because closing them would be intolerable.

Traffic is organised through a traffic separation scheme adopted at the International Maritime Organization — inbound and outbound lanes with a separation zone between them. At the narrowest point those lanes run through Omani territorial waters, not Iranian ones, which is a detail often lost in discussion of who can interfere with shipping.

Key entities or individuals involved

Iran and Oman hold the territorial waters. The International Maritime Organization sets the routeing measures. Naval forces operate there to protect shipping, including the US Fifth Fleet based in Bahrain and the multinational Combined Maritime Forces.

The commercial stakes are what make it matter: roughly a fifth of the world’s oil consumption passes through, together with a large share of seaborne liquefied natural gas, from Saudi Arabia, Iraq, the UAE, Kuwait, Qatar and Iran itself.

No company, individual or organisation has any proprietary interest. The parties are states.

How the relationship is verified

Three sources settle the position, and all are public.

The text of UNCLOS sets out the transit passage regime. The United Nations list of parties shows who is bound by it — and this is where it gets complicated. Oman ratified UNCLOS. Iran signed it in 1982 but has never ratified it, and has stated that transit passage is available only to parties to the convention. The United States is also not a party, but maintains that transit passage is customary international law binding on everyone regardless.

So the legal position is contested at exactly the point that matters most. The IMO’s published routeing measures confirm where the lanes run and whose waters they cross.

Ownership history

The strait’s status has never been a question of ownership changing hands. What has changed is the law and the balance of force.

Before the twentieth century, territorial seas were generally reckoned at three miles, leaving a corridor of high seas through the middle. The move to a 12-mile territorial sea, settled in UNCLOS in 1982, closed that corridor — and the transit passage regime was created in the same negotiation to compensate for it. The two changes were a package.

Iran has repeatedly threatened to close the strait, most prominently during the Iran–Iraq “tanker war” of the 1980s and in periods of sanctions since. It has never done so for any sustained period. Attacks on shipping, seizures of individual vessels and mine-laying have all occurred; a lawful closure has not, because no state has the right to effect one.

Sources and limitations

This page rests on the text of UNCLOS, the UN’s published ratification status, and IMO routeing measures — all authoritative and all freely available. No Companies House record, land registry or ownership filing is relevant, because the strait is not property.

The limitation is that international law is contested rather than adjudicated here. Iran’s non-ratification and its stated view of transit passage are matters of record; whether that view is correct has never been settled by a court, and no court is likely to settle it. Anyone relying on this page for operational or legal purposes should take proper advice — the strait’s status is a live geopolitical question, not a fixed fact.