Police used teargas to disperse around 3,000 protesters who gathered on Sunday outside the provincial government headquarters in the southern oil hub of Basra, amid growing unrest in southern cities over poor public services and corruption.
Some protesters also set fire to tires outside the building and there were minor clashes with riot police who fired tear gas to try to quell the protest. No serious injuries were reported.
Earlier on Sunday, police used tear gas to disperse around 150 protesters at the main entrance to Iraq's giant Nahr Bin Omar oilfield, police sources said.
Protests have swept cities in the long neglected south, Iraq's Shia Muslim heartland, over widespread electricity outages during the blistering hot Iraqi summer, a lack of jobs and proper government services, and entrenched graft.