The United States Geological Survey said the quake measuring a moderate 5.2 struck at 4:45 am (0115 GMT) at a depth of 10 kilometres (6.2 miles) near the port city of Genaveh in Bushehr province.
A 4.6 magnitude aftershock followed more than two hours later, USGS added.
Local officials cited by IRNA said three people were hurt but there was no significant damage.
Bushehr, home to a nuclear power plant, was also hit by an earthquake in April. The 5.9-magnitude quake injured five people but caused no major damage.
Iran, located at the intersection of several tectonic plates, is a zone of high seismic activity.
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