The deadliest attack took place in Khilani Square, a busy commercial area in central Baghdad, where a car bomb killed at least seven people and wounded 25, a police officer said. The car was parked near a Sunni mosque and a gathering of motorcycle vendors.
Hours earlier, an explosives-laden car ripped through a commercial area in the town of Mahmoudiya, about 30 kilometres south of Baghdad, killing at least four civilians and wounded another nine, another police officer said.
Three people were killed and 13 wounded in another car bomb explosion in Baghdad's southwestern Amil neighbourhood, he added.
Baghdad sees near-daily bombings mainly targeting security forces and the country's Shiite majority. The Islamic State group and other Sunni extremists are believed to be behind the attacks.
More From This Section
Government forces are struggling to dislodge Islamic State militants from the western province of Anbar and much of northern Iraq.
Iraqi troops backed by Shiite militias and US-led airstrikes managed to retake the northern city of Tikrit, but they have also suffered a number of setbacks.
Yesterday, IS militants attacked a border crossing between Iraq and Jordan with three suicide car bombs, killing four Iraqi soldiers.