A court in Ahwaz sentenced the 15 individuals to flogging and jail time for creating mayhem and disrupting public order.
They had all been arrested during anti-government protests on July 27 and were accused of setting tyres on fire in the street and throwing stones at government buildings and vehicles belonging to the State Security Forces.
There were heavy clashes between government forces and protesters in Ahwaz during the final week of July.
The citys local state-run radio urged residents to stay at home as security forces imposed curfew on the areas of the city inhabited by ethnic Arabs.
Protestors chanted anti-government slogans and demanded an end to the governments ethnic cleansing policy.
Ahwaz, provincial capital of Khuzistan, is home to Irans ethnic Arab population and has been a hotbed of anti-government demonstrations.
Dozens of people were reportedly killed in week-long clashes between mainly ethnic Arab protesters and security forces in Ahwaz and several other cities in Irans Khuzistan province in April. The strategic area contains much of Irans oilfields.