The Navy of Islamic Republic of Iran Army (Persian: نیروی دریایی ارتش جمهوری اسلامی ایران) acronymed NEDAJA (Persian: نداجا), is the naval warfare service branch of Iran's regular military, the Islamic Republic of Iran Army (Artesh).
It is charged with the responsibility of forming Iran's first line of defense in the Gulf of Oman and beyond with the mission of acting as an effective blue-water navy. However, it is generally considered as a conventional green-water navy as it mostly operates at a regional level, in the Persian Gulf and Gulf of Oman but also as far afield as the Red Sea, the Mediterranean Sea and northwest quarter of the Indian Ocean. In July 2016, the Navy said that it would establish a presence in the Atlantic Ocean, of unspecified duration.
One of Iran's two maritime military branches alongside the Islamic Revolutionary Guard Corps Navy (IRGC Navy), it overlaps functions and areas of responsibility with the other navy, but they are distinct in terms of military strategy and equipment. In contrast to the IRGC Navy, which is equipped with small fast-attack crafts, the backbone of the Artesh navy's inventory consists of larger surface ships, including frigates, corvettes, and submarines.