The attacks happened across the Diyala Province. 60 people were killed, most of them in the southern city of Kut.
The coordinated blasts went off morning. They included a combination of parked car bombs and roadside bombs. A suicide bomber also drove a vehicle into a police station.
The bloodbath comes less than two weeks after Iraqi officials said they would be open to a small number of U.S. forces staying in the country past a Dec. 31 withdrawal deadline.
The scope of the violence- seven explosions went off in different towns in Diyala province alone - emphasized that insurgents are still able to carry out attacks despite repeated crackdowns by Iraqi and U.S. forces.
Iraqis were furious at security officials and Prime Minister Nouri al-Maliki. Al-Maliki's spokesman and the military spokesman did not answer telephone calls.
The wave of violence is the worst attack this year, shattering what had been a relatively peaceful holy month of Ramadan.
The Associated Press contributed to this story.