The move is seen as part of Iran's effort to upgrade its defense capabilities amid escalating tension with the West over its nuclear program.
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Tehran has threatened to close the strategic Strait of Hormuz, a major oil shipping route, over new US sanctions targeting its critical oil industry.
The state-run IRNA news agency quoted Iran's Navy Chief Admiral Habibollah Sayyari as saying the Ghadir class submarines meet the needs of the navy.
In November, Iran said it added three more Ghadir class submarines to its naval fleet. This class of submarine can fire missiles and torpedoes and operate in the Gulf's shallow waters.
Iran is believed to have about 12 light and three Russian-made submarines in its fleet, but it does not disclose the total numbers.
The report follows recent statements by Tehran asserting that it is capable of carrying out military strikes on American targets around the world.
Iranian Ambassador to Moscow Seyed Mahmoud-Reza Sajjadi said Wednesday that the United States "would be making a serious mistake, akin to suicide, if it risked a military strike on Iran.
"The Americans know what kind of country Iran is. They are well aware of our people's unity… And that's why Iran is fully able to deliver retaliatory strikes on the United States anywhere in the world.
"Even if it attacks," he added, "We have a list of counter actions. (The United States) would be disappointed with their huge mistake," the ambassador said.
Reuters contributed to this report
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