The worst attacks, in the town of Khanaqin near the Iranian border, suicide bombers struck two Shia mosques killing at least 74 people.
The bombers blew themselves up while hundreds of worshippers were attending Friday prayers, in what is being seen as an act of sectarian provocation.
The attacks outside an interior ministry building in the central Jadiriya district injured at least 40 people and brought down a block of flats.
