A 7.3 magnitude natural disaster has struck near the Iran/Iraq border, the US Geological Survey said.
The temblor was centred 32km southwest of Halabja, Iraq, near the northeastern border with Iran, the US Geological Survey said.
State television from the country added that it had been felt in a number of cities and villages had been damaged, with various villages out of electricity.
Semi-official Fars news agency and state news agency IRNA said at least six people were killed and many others injured in the border town of Qasr-e Shirin.
There are reports of injuries and casualties due to the natural disaster.
Many houses in rural parts of the province are made of mud bricks and are known to crumble easily in quake-prone Iran.
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Iranian provinces in the northwestern, western and central areas of the country were impacted, according to Iranian state TV.
Residents of Turkey's southeastern city of Diyarbakir also reported feeling a strong tremor.
Photos posted by a person from Iran show a shattered building and cracked walls in the city of Baneh in west Iran.
The quake struck the mountainous area of Sulaimaniyah province at 9:18 pm (1818 GMT) at a depth of 25 kilometres (15 miles), the monitor said.
"I felt like I was on a boat, I thought it was vertigo".