Title: Government of the Islamic Republic of Iran
Content:  The Government of the Islamic Republic of Iran (, known simply as Neẓām among its supporters) is the ruling state and current political system in Iran, in power since the Islamic revolution and fall of the Pahlavi dynasty in 1979. Its constitution, adopted by an ex post facto referendum, uses separation of powers model with Executive, Legislative, and Judicial systems, while the Supreme Leader is the country's head of state and commander-in-chief of the armed forces. It is currently one of the three governments using the title Islamic republic.
Title: Iran
Content:  to launch a far-reaching series of reforms in 1963. After the Iranian Revolution, the current Islamic Republic was established in 1979 by Ruhollah Khomeini, who became the country's first Supreme Leader. The Government of Iran is an Islamic theocracy which includes elements of a presidential democracy, with the ultimate authority vested in an autocratic "Supreme Leader", a position held by Ali Khamenei since Khomeini's death in 1989. The Iranian government is widely considered to be authoritarian, and has attracted widespread criticism for its significant constraints and abuses against human rights and civil liberties,   including several violent suppressions of mass protests, 
Title: Iran
Content:   The 1979 Revolution, later known as the Islamic Revolution,  began in January 1978 with the first major demonstrations against the Shah. After a year of strikes and demonstrations paralyzing the country and its economy, Mohammad Reza Pahlavi fled to the United States, and Ruhollah Khomeini returned from exile to Tehran in February 1979, forming a new government. After holding a referendum, Iran officially became an Islamic republic in April 1979. A second referendum in December 1979 approved a theocratic constitution. The immediate nationwide uprisings against the new government began with the 1979 Kurdish rebellion and the Khuzestan uprisings, along with the uprisings in Sistan and Baluchestan and other areas. Over 
Title: Interim Government of Iran
Content:  The Interim Government of Iran was the first government established in Iran after the Iranian Revolution. The regime was headed by Mehdi Bazargan, one of the members of the Freedom Movement of Iran, and formed on the order of Ruhollah Khomeini (known as the Ayatollah Khomeini) on 4 February 1979. From 4 to 11 February, Bazargan and Shapour Bakhtiar, the Shah's last Prime Minister, both claimed to be the legitimate prime minister; Bakhtiar fled on 11 February. Mehdi Bazargan was the prime minister of the interim government and introduced a seven-member cabinet on 14 February 1979. Ebrahim Yazdi was elected as the Foreign Minister. The constitution of the Islamic Republic of Iran was adopted by referendum on 24 October 1979. Before it could come into force on 3 December 1979, however, the government resigned on 6 November soon after the taking over of the American embassy, an act the government opposed but revolutionary leader Khomeini reluctantly supported. The Council of the Islamic Revolution then served as the country's government until the formation of the first Islamic Consultative Assembly on 12 August 1980. Bazargan was elected to the first Islamic Consultative Assembly representing Tehran.
Title: History of the Islamic Republic of Iran
Content:  One of the most dramatic changes in government in Iran's history was seen with the 1979 Iranian Revolution where Shah Mohammad Reza Pahlavi was overthrown and replaced by Ayatollah Ruhollah Khomeini. The patriotic monarchy was replaced by an Islamic republic based on the principle of rule by Islamic jurists, (or "Velayat-e faqih"), where clerics serve as head of state and in many powerful governmental roles. A pro-Western, pro-American foreign policy was exchanged for one of "neither east nor west", said to rest on the three "pillars" of mandatory veil (hijab) for women, and opposition to the United States and Israel. A rapidly modernizing capitalist economy was replaced by a populist and Islamic economy and culture. The leader of the revolution and founder of the Islamic Republic, Ayatollah Ruhollah Khomeini, was the Supreme Leader of Iran until his death in 1989. He was followed by Ali Khamenei.
Title: Sectarianism
Content:  The Iranian 1979 revolution led to the overthrow of the Pahlavi dynasty and the establishment of the Islamic Government of Iran. The governing body of Iran displays clear elements of sectarianism which are visible within different layers of its system. The 1979 revolution led to changes in political system, leading to the establishment of a bureaucratic clergy-regime which has created its own interpretation of the Shia sect in Iran. Religious differentiation is often used by authoritarian regimes to express hostility towards other groups such as ethnic minorities and political opponents. Authoritarian regimes can use religion as a weapon to create an  "us and them"  paradigm. This leads to 
Title: Organizations of the Iranian Revolution
Content:  The Provisional Revolutionary Government or "Interim Government of Iran" (1979–1980) was the first government established in Iran following the overthrow of the monarchy. It was formed by order of Ayatollah Khomeini on February 4, 1979, while Shapour Bakhtiar (the Shah's last Prime Minister) was still claiming power. Ayatollah Khomeini appointed Bazargan as the prime minister of "The Provisional Revolutionary Government" on February 4, 1979. According to his commandment: "'Mr. Engineer Bazargan, Based on the proposal of the Revolutionary Council, in accordance with the sharia based rights and legal rights which are both originated from the decisive and closely unanimous votes of Iranian nation for leadership of the movement, which in turn has been expressed in the vast gatherings and wide and numerous 
Title: Secularism in Iran
Content:  political schools of thought which advocate separation of religion and state, and both blamed the British for the rise of Islamism and radical Islam in Iran and the Middle East. For this reason Pahlavi Iran vigorously pursued close relations with France and the United States. In 1979, after the deposition of the government of Prime Minister Shapour Bakhtiar in February of that year, an interim government was established under Prime Minister Mehdi Bazargan which sought to establish a nationalist Islamic democratic government with pro-free market economic policy, in opposition to the wishes of Ayatollah Ruhollah Khomeini and his pro-Islamic Republic faction. Bazargan's government resigned en masse in November 1979 immediately after the US Embassy takeover by radicalist 
Title: Government of the Islamic Republic of Iran
Content:  The Islamic Republic of Iran was created shortly after the Islamic Revolution. The first major demonstrations with the intent to overthrow the Shah Mohammad Reza Pahlavi began in January 1978, with a new, Islam-based, theocratic Constitution being approved in December 1979, ending the monarchy. The Shah fled Iran in January 1979 after large strikes and demonstrations against him and his regime paralyzed the country. Ayatollah Khomeini would return in February of the same year after a long period of exile, greeted in the capital of Tehran by several million Iranians. The final collapse of the Pahlavi dynasty occurred shortly after on February 11 when Iran's military declared itself officially "neutral" after guerrillas and rebel troops overwhelmed forces loyal to the Shah in street fights throughout the country. After the victory of the Islamic Revolution, a referendum was held by Interim Government of Iran on the 30th and 31 March 1979 (10 and 11 Farvardin 1358), asking people to vote either Yes or No to an Islamic Republic. The results of the referendum were announced soon after by Ayatollah Khomeini on April 2, 1979, with 98.2 percent of the Iranian citizens voting in favor of an Islamic Republic.
Title: Freedom Movement of Iran
Content:   The Islamic Republic of Iran was proclaimed on 1 April 1979 after the results of a referendum in which allegedly more than 98% voted for this system. The Provisional Government took office on 12 February, right after the former government fell, but it quickly became apparent that this government lacked any real power, which was instead concentrated in the Islamic Revolutionary Council (which was dominated by hard-line religious fundamentalists) and the local Islamic Komitehs (committees). The PG was composed mainly of elements from the FMI (including Bazargan, Taleghani, Sahabi, Yazdi, Nazih), but also included a few leaders of the National Front (Sanjabi, Ardalan, Forouhar). This period expressed the height of the LMI's influence over 

Question: what kind of government does iran have after 1979?
Answer: Islamic republic.