The figures compiled by the defense, interior and health ministries were released late Sunday, showing 112 dead and 357 wounded last month.
Those who made up the death toll were 78 civilians, 22 policemen and 12 soldiers.
The previous monthly low was in November 2009 when 122 died.
The bloodiest incidents were a series of coordinated attacks in eight Iraqi cities on March 20 as insurgents sought to derail an Arab League meeting in Baghdad. In one day, 46 people were killed and more than 200 wounded.
Despite that, tight security measures that were imposed in advance of the Friday summit appear to have prevented further attacks.
Violence has dropped significantly in Iraq over the past three years, but insurgents often carry out attacks in order to shake people's confidence.