Here are key dates in the Iranian presidency of Mahmoud Ahmadinejad, who is running for a second term against three challengers in a presidential election on Friday.
- June 25: Ahmadinejad wins the presidential election in a second-round runoff.
- August 8: Iran resumes nuclear activities at its uranium enrichment plant at Isfahan in the centre of the country.
The programme had been suspended since November 2004 under an agreement with EU member states Britain, France and Germany. Western countries say they believe its real purpose is to make an atomic bomb. Its activities have under an International Atomic Energy Agency probe since early 2003.
- October 26: Ahmadinejad says Israel is "doomed to be wiped off from the map", provoking an international uproar. He repeatedly rails against Israel and the Jews, describing the Holocaust as a "myth".
- June 23: 50 Iranian economists publish an open letter challenging the government's policy of injecting masses of petro-dollars into the economy, saying the move is inflationary.
- December 23: The UN Security Council votes to impose limited trade sanctions on Iran for its refusal to suspend its sensitive nuclear work.
- September 23: Visiting New York for a session of the Security Council, Ahmadinejad is invited to speak at Columbia University.
- October 16: Russian President Vladimir Putin becomes the first Russian or Soviet leader to visit Tehran since 1943.
- March 14/April 25: Conservatives win a resounding victory in legislative elections.
- September 23: The economy minister and the head of the central bank resign after criticising the government's economic policy. The annual inflation rate has risen above 27 percent.
- December 21: Police close the offices of the Human Rights Defenders Centre led by Nobel Peace laureate Shirin Ebadi.
- February 3: Iran announces the launch of its first home-built satellite, Omid (Hope). The satellite was carried into space by domestically manufactured Safir-2 rocket.
- February 25: Russian officials conduct tests at Iran's first nuclear power plant built by Moscow in southern port city of Bushehr.
- March 20: US President Barack Obama addresses Iranian leaders directly, offering to end 30 years of hostility, in a message for Iran's new year.
- April 9: Ahmadinejad opens a nuclear fuel plant in Isfahan and announces the testing of two high capacity centrifuges, indicating that Iran has mastered the complete nuclear fuel cycle from uranium mining to enrichment.
- April 30: The US State Department says Iran is the "most active state sponsor of terrorism" in the world.
- May 25: Ahmadinejad says Iran will not hold nuclear talks with the group of world powers known as 5-plus-1, which have been suspended since September.
- May 28: A bomb blast at a Shiite mosque in the city of Zahedan kills 25 people, one of a number of violent incidents in Iran during the election campaign.