In a statement, the ministry advised owners and users of all maritime vessels, including leisure boats, fishing boats, jet skis and other watercraft, to temporarily suspend sailing and all marine activities until further notice.
The ministry said the measure does not apply to vessels operating under international maritime conventions.
It added that the precautionary measure was taken in coordination with the relevant security authorities, urging the public to comply with the directive and obtain updates only through official channels.
The United States launched a fresh round of strikes on Iranian military targets on Sunday, while Iran retaliated by targeting US bases and facilities across the Persian Gulf.