The National Library of Iran is located in Tehran, Iran, with several branches are scattered throughout the city.
Prior to the library's official inauguration in 1937, other libraries existed that performed the same function informally. The first prototype of a national library in Iran was the Library of Dar al-Funun College, established in 1851. In 1899, another library called the "Nation's Library" was inaugurated in Tehran.
More information on the Wikipedia page [1] and the website is [2].