Title: National language
Content:  Persian (or Farsi) is recognised as the national language of Iran.
Title: Iranian Persian
Content:  Iran's national language has been called, apart from Persian or Farsi, by names such as Iranian Persian, Western Persian and Western Farsi, exclusively. Officially, the national language of Iran is designated simply as Persian (فارسی, fārsi).
Title: Languages of Iran
Content:  Iran's ethnic diversity means that the languages of Iran come from a number of linguistic origins, although the primary language spoken and used is Persian. The Constitution of the Islamic Republic of Iran asserts that the Persian language alone must be used for schooling and for all official government communications. The constitution also recognizes Arabic as the language of Islam, and assigns it formal status as the language of religion. Although multilingualism is not encouraged, the use of minority languages is permitted in the course of teaching minority-language literature. Different publications have reported different statistics for the languages of Iran; however, the top three languages spoken are consistently reported as Persian, Azeri and Kurdish.
Title: Culture of Iran
Content:  Several languages are spoken throughout Iran. Languages from the Iranian, Turkic, and Semitic language families are spoken across Iran. According to the CIA Factbook, 78% of Iranians speaks an Iranian language as their native tongue, 18% speak a Turkic language as their native tongue and 2% speak a Semitic language as their native tongue while the remaining 2% speak languages from various other groups. Although the Azerbaijanis speak a Turkic language, due to their culture, history and genetics, they are often associated with the Iranian peoples. The predominant language and national language of Iran is Persian, which is spoken fluently across the country. Azerbaijani is spoken primarily and widely in 
Title: Languages of Iran
Content:  The current Language Policy of Iran is addressed in Chapter Two of the Constitution of the Islamic Republic of Iran (Articles 15 & 16). It asserts that the Persian language is the lingua franca of the Iranian nation and as such, required for the school system and for all official government communications. In addition, the constitution recognizes the Arabic language as the language of Islam, giving it formal status as the language of religion and regulating its spread within the Iranian national curriculum. Due to the nation's unique social and ethnic diversity, the constitution also acknowledges and permits the use of minority languages in the mass media 
Title: Iran
Content:  The majority of the population speak Persian, which is also the official language of the country. Others include speakers of a number of other Iranian languages within the greater Indo-European family, and languages belonging to some other ethnicities living in Iran. In northern Iran, mostly confined to Gilan and Mazenderan, the Gilaki and Mazenderani languages are widely spoken, both having affinities to the neighboring Caucasian languages. In parts of Gilan, the Talysh language is also widely spoken, which stretches up to the neighboring Republic of Azerbaijan. Varieties of Kurdish are widely spoken in the province of Kurdistan and nearby areas. In Khuzestan, several distinct varieties of Persian are spoken. Luri and Lari are also spoken in southern Iran. Azerbaijani, which is by far the most spoken language in the country after Persian, as well as a number of other Turkic languages 
Title: Education in Iran
Content:  Persian is officially the national language of Iran. Arabic, as the language of Koran, is taught grades 7-12. In addition to Arabic, students are required to take one foreign language class in grades 7-12. Although German and French are offered in some schools and textbooks have been written, English continues to be the most desired language. Kanoun-e-Zabaan-e-Iran or Iran's Language Institute affiliated to Center for Intellectual Development of Children and Young Adults was founded in 1979. Persian, English, French, Spanish, German, Russian and Arabic are taught to over 175,000 students during each term. English language is studied in first and second high school. 
Title: Languages in censuses
Content:  The majority of the population speaks Persian, which is also the official language of the country, as well as other Iranian languages or dialects. Turkic languages and dialects, most importantly Azerbaijani language, are spoken in different areas in Iran. In southwestern and southern Iran, Luri and Lari are spoken. In Kurdistan Province and nearby area's Kurdish is widely spoken. In Khuzestan, many distinct Persian dialects are spoken. Arabic is also spoken in Khuzestan. Notable minority languages in Iran include Armenian, Georgian, and Neo-Aramaic. Circassian was also once widely used by the large Circassian minority, but due to assimilation over the many years no sizable number of Circassians speak the language anymore.
Title: Constitution of the Islamic Republic of Iran
Content:  Article 15 states that the "Official language and writing script (of Iran)... is Persian ...[and]... the use of regional and tribal languages in the press and mass media, as well as for teaching of their literature in schools, is allowed in addition to Persian." Per Article 16, "Since the language of the Qur'an and Islamic texts ... is Arabic it must be taught ... in school from elementary grades until the end of high school."
Title: Ethnic minorities in Iran
Content:  The Constitution of Iran guarantees freedom of cultural expression and linguistic diversity. Many Iranian provinces have radio and television stations in local language or dialect. School education is in Persian, the official language, but use of regional languages is allowed under the constitution of the Islamic Republic, and Azeri language and culture is studied at universities and other institutions of higher education. Article 15 of the constitution states: The Official Language and script of Iran, the lingua franca of its people, is Persian. Official documents, correspondence, and texts, as well as text-books, must be in this language and script. However, the use 

Question: what is the national language of iran?
Answer: Persian Language.