The Islamic Republic of Iran Navy (IRIN; Persian: نیروی دریایی ارتش جمهوری اسلامی ایران), officially abbreviated NEDAJA (Persian: نداجا), is the naval warfare service branch of Iran’s regular military, the Islamic Republic of Iran Army (Artesh). It is one of Iran’s two maritime military branches, alongside the Navy of the Islamic Revolutionary Guard Corps (IRGC).

NEDAJA is charged with forming Iran’s first line of defense in the Gulf of Oman, Persian Gulf and abroad. It is generally considered to be a conventional green-water navy, as it mostly operates regionally, namely in the Red Sea, Mediterranean Sea, and northwest quarter of the Indian Ocean. The Navy aims to develop blue-water capabilities: in July 2016, it announced plans to establish a presence in the Atlantic Ocean, and as of May 2021 has sent ships into the region.