The Islamic Revolutionary Guard Corps Navy (IRGCN; ; officially abbreviated in Persian as NEDSA and also known as the Sepah Navy) is the naval warfare service of the Islamic Revolutionary Guard Corps founded in 1985, and one of the two maritime forces of Iran, parallel to the conventional Iranian Navy.
In contrast to a conventional Navy, the IRGC Navy follows a distinct doctrine, training system, and equipment structure, prioritizing asymmetric maritime warfare through the use of small fast-attack craft, anti-ship missiles, naval mines, and hit-and-run and swarm tactics rather than traditional naval engagements, and is often described as a âÂÂguerrilla navy.â The IRGC Navy also acts as Iran's de facto coast guard and maintains several Marine infantry units, including a naval Takavar battalion, called Sepah Navy Special Force (SNSF).
The Basij Navy has been established with a force of 55,000 sailors and 33,000 boats covering an area from the Persian Gulf to Tanzania, Dar es Salaam, and Zanzibar.
The forces are known with their official abbreviation in Persian, "NEDSA". In maritime radio communications, it is addressed as "Sepah Navy".
On 17 September 1985, Iran's supreme leader and commander-in-chief Ruhollah Khomeini ordered Islamic Revolutionary Guard Corps to create three branches including navy. Shortly afterwards, Hossein Alaei was appointed as the commander of the naval forces. The navy was tasked to operate in the Persian Gulf and by 1987 were able to play an active role against Iraqi Navy in the IranâÂÂIraq War.
During the "Tanker War" phase of the IranâÂÂIraq War, beside the regular Iranian Navy, IRGC started employing swarm tactics and surprise attacks using Boghammar speedboats fitted with rocket launchers, RPGs, and heavy machine guns. Attacks on Kuwaiti tankers, an Iraqi ally, eventually dragged the US Navy into the Persian Gulf to escort Kuwaiti tankers. As a response, IRGC ordered mining west of Farsi Island on the route of the very first convoyâÂÂthe Kuwaiti supertanker SS Bridgeton escorted by four US warshipsâÂÂwhich successfully hit the tanker itself.
The 1988 naval battle between Iran and the US, Operation Praying Mantis, resulted in 1 Iranian frigate being lost (45 crew members killed), 1 gunboat (11 crew members killed), 3 speedboats, and 2 platforms. The US suffered 2 casualties due to an AH-1T Sea Cobra crashing or being shot down.
On 21 June 2004, eight sailors and Royal Marines were seized by forces of the Revolutionary Guards' Navy while training Iraqi river patrol personnel in the Persian Gulf. On 23 March 2007, fifteen sailors and Royal Marines from HMS Cornwall were seized by forces of the Revolutionary Guards' Navy in the Persian Gulf.
On 7 January 2008, US officials claimed five Iranian speedboats 'harassed' United States Navy vessels in the Persian Gulf. IRGC speedboats made threatening moves and in one case even came within 180 meters of US warships. The US Navy also claimed to have received a radio transmission from Iranian boats saying: "I am coming at you. You will explode in a couple of minutes". After this US ships were said to have taken up their gun positions and were ready to open fire at one of the boats when the Iranians turned away and one of the Iranian speedboats (allegedly) dropped white boxes into the water in front of the U.S. ships, it was not clear what was in the boxes.
Iranian officials and military commanders later downplayed the incidents as normal and denied having sent the radio transmission. After the US released a video showing Iranian speedboats swarming US ships in the Strait of Hormuz, Iran released its own video of the incident after suggesting the US video was staged.
On 12 January 2016, 10 American sailors were taken into custody by IRGC officials off the coast of Farsi Island, which doubles as a naval installation for the IRGC. American officials stated that the sailors were on a training mission when one of their boats experienced a mechanical failure. During this time the vessel drifted into Iranian territorial waters spurring IRGC naval units to respond and apprehend the sailors with both vessels. US Secretary of State John Kerry engaged in a phone call with Iranian officials to defuse the situation. Iranian officials said that the sailors were in custody, but would be freed within hours, understanding that the incident was a mistake.
In 2019, the IRGC Navy allegedly carried out a series of attacks on international vessels in the Gulf of Oman and seized vessels taking them to Iran. As a result, the United States started the International Maritime Security Construct (IMSC) which increases overall surveillance and security in key waterways in the Middle East, according to the Deputy Secretary of Defense Michael Mulroy.
On 26 March 2026, Israeli sources claimed the death of IRGCN head Alireza Tangsiri, who had been leading a blockade of the Strait of Hormuz. Israeli Defense Forces later reported that all of the IRGC NavyâÂÂs other key commanders were killed in the strike with Tangsiri as well. U.S. Central Command leader Admiral Brad Cooper afterwards described the Islamic Revolutionary Guard Corps Navy, which had also been greatly damaged from the ongoing 2026 Iran War, as now being "on an irreversible decline." The death of Tangsiri was confirmed some days later by Iran. Nevertheless, Iran has still remained determined to assert control over the Strait of Hormuz.
IRGC Navy and Artesh Navy overlap functions and areas of responsibility, but they are distinct in terms of how they are trained and equippedâ and more importantly also in how they fight. The Revolutionary Guards Navy has a large inventory of small fast attack craft, and specializes in asymmetric hit-and-run tactics. It is more akin to a guerrilla force at sea, and maintains large arsenals of coastal defense and anti-ship cruise missiles and mines.
Janes recognizes the IRGCN as the resuscitator of fast inshore attack craft (FIAC) in the modern era, as well as the most prominent practitioner of "small boat swarm tactics that combine speed, mass, co-ordinated manoeuvre, low radar signature, and concealment" among naval forces of the world.
It has also a Takavar (special force) unit, called Sepah Navy Special Force (S.N.S.F.).
In 2022, the IRGCN had unveiled a new uniform ditching its usual green in favor of white.
The corps put forward a warfare organization for civilian Iranian citizens fleet since 2019, with the intent to help fight wars and combat contraband and smuggling too.
According to 'The Military Balance 2020' of the International Institute of Strategic Studies (IISS), the inventory included:
In addition to the vessels mentioned above, IRGC operates a fleet of armed speedboats with displacement below 10 tonnes, the exact number of which is unknown. Back in 2007, the U.S. Office of Naval Intelligence estimated IRGC had a fleet of 1,000 speedboats that was growing. As of 2011, estimates ranged widely from "hundreds" to "several thousand". The number was put between 3,000 and 5,000 vessels according to most recent reports in 2020.
Classes of speedboats in the inventory include:
Based on the IISS report, as of 2020 Iranian aircraft inventory includes: