At least 21 people have been killed and more than 85 injured in a series of bombs throughout Baghdad, police said, reported BBC.
In the most serious attack, at least 12 people were killed and 60 injured when almost simultaneous car and roadside bombs detonated in eastern Baghdad.
Earlier a car bomb killed four people and injured 14 during the morning rush hour in a busy central shopping area.
Police also said five people were killed and 12 wounded in an explosion in the north of the capital.
It is the third consecutive day of bombing Baghdad. More than 30 were killed on Monday and Tuesday in blasts with struck during the morning rush-hour.
The attacks come as Iraqi and US officials try to reach a final deal on a long-term security pact.
Wednesday's rush-hour attack happened in a car park off Saadoun Street - an important Baghdad thoroughfare.
In the next attack, which killed five people, a roadside bomb blew up in the mainly Shia Muslim Shaab neighbourhood in north Baghdad, officials said.
And hours later a bomb exploded in the New Baghdad district, followed closely by a car explosion after police arrived at the scene. The death toll stood at 12.
Correspondents say overall security in Iraq has improved significantly over the past year as US and Iraqi forces allied with local Sunni militias have flooded into formerly ungovernable districts.
However, recent weeks have seen a return of smaller bombings that have hit during rush hour. This has undermined public confidence around the city.