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: 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 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: 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: National language
Content:  Persian (or Farsi) is recognised as the national language of Iran.
Title: List of multilingual countries and regions
Content: Bahrain: Arabic is the official language, and English is the most commonly used and studied second language, especially in education, international relations, and the media. In addition, Persian and Urdu are widely spoken. ; In Iran, Persian is the sole official language, but Azerbaijani (along with related varieties such as Qashqa'i and Kalaj) has upwards of 15 million speakers. Other minority languages include Kurdish, Turkmen, and Balochi. Assyrian is spoken by a Christian minority in the vicinity of Urmia. In the southwestern Iranian province of Khuzestan, most people speak Khuzestani Persian, Khuzestani Arabic, and Standard Persian, sometimes in addition to their own community languages such as Lur, Qashqa'i, Domari or Mandaic where applicable. ; In Iraq, Arabic is the 
Title: Demographics of Iran
Content:  The largest linguistic group comprises speakers of Iranian languages, like modern Persian, Kurdish, Gilaki, Mazandarani, Luri, Talysh, and Balochi. Speakers of Turkic languages, most notably Azerbaijanis, which is by far the second-most spoken language in the country, but also the Turkmen, and the Qashqai peoples, comprise a substantial minority. The remainder are primarily speakers of Semitic languages such as Arabic and Assyrian. A small number of Mandaeans in Khuzistan speak Mandaic. There are small groups using other Indo-European languages such as Armenian, Russian, Georgian (a member of the Kartvelian language family), spoken in a large pocket only by those Iranian Georgians that live in Fereydan, Fereydunshahr. Most of those Georgians who live in the north Iranian provinces of Gilan, Mazandaran, Isfahan, Tehran Province and the rest of Iran 
Title: Languages of Iran
Content:  A census was taken in the Iranian month of Mordad (July 21 – August 21) in 1991. In this census, all 49,588 mothers who gave birth in the country were issued birth certificates and asked about their mother-tongue. They reported: 46.2% (Persian), 20.6% (Azerbaijani), 10% Kurdish, 8.9% Luri, 7.2% Gilaki and Mazandarani, 3.5% Arabic, 2.7% Baluchi, 0.6% Turkmen, 0.1% Armenian, and 0.2% Others (e.g. Circassian, Georgian, etc.). The local dialect of Arabic spoken in Iran is Khuzestani Arabic, an Iraqi Arabic dialect, but the varieties of Arabic taught across Iran to students in secondary schools, regardless of their ethnic or linguistic background, are Modern Standard Arabic and Classical Arabic, the latter a liturgical language of Islam.
Title: Iranian languages
Content:  The Iranian or Iranic languages are a branch of the Indo-Iranian languages in the Indo-European language family that are spoken natively by the Iranian peoples. The Iranian languages are grouped in three stages: Old Iranian (until 400 BC), Middle Iranian (400 BC – 900 AD), and New Iranian (since 900 AD). The two directly attested Old Iranian languages are Old Persian (from the Achaemenid Empire) and Old Avestan (the language of the Avesta). Of the Middle Iranian languages, the better understood and recorded ones are Middle Persian (from the Sasanian Empire), Parthian (from the Parthian Empire), and Bactrian (from the Kushan and Hephthalite empires). As of 2008, there were an estimated 150–200 million native speakers of the Iranian languages. Ethnologue estimates that there are 86 languages in the group, the largest among them being Persian (Farsi, Dari, Tajik), Pashto, Kurdish, Lurish and Balochi languages.
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 kind of language do they speak in iran?
Answer: Turkmen Language.