The bombers targeted three crowded markets - two in predominantly Shia areas of Baghdad.
American Blackhawk helicopters patrolled over the site of the attacks.
Iraqi shopkeepers tried to salvage stock before their property was engulfed by flames.
The markets were packed with shoppers, and there were dozens of casualties.
Relatives searched desperately for their loved ones in the rubble.
The attacks came on the anniversary of the bombing of the revered al-Askari shrine in Samarra.
Black smoke billowed over the city on another day of bloody violence in Baghdad.