United Nations Secretary General Ban Ki-moon was in Iraq on Friday, a U.N. official said, and was expected to have talks with Prime Minister Nuri al-Maliki.
Ban's visit came almost a week after Iraq held its most peaceful election since the 2003 U.S.-led invasion.
Ban's unannounced visit followed a trip to Afghanistan, and to India and Pakistan.
Ban was expected to meet Iraqi officials to discuss last Saturday's provincial election and other issues as Iraq begins to emerge from years of sectarian bloodshed and insurgency unleashed by the invasion.
Preliminary results released on Thursday showed that allies of Iraqi Prime Minister Nuri al-Maliki scored spectacular gains across Iraq's Shi'ite Muslim south.
Elsewhere in the country, once dominant Sunni Arabs who boycotted Iraq's last local polls in 2005 regained political power in areas.