In the bloodiest, at least 19 soldiers were killed and some 40 wounded when a double suicide car bombing targeted their military base in the town of Tarmiyah.
Earlier, police said a bombing at a tent serving food to pilgrims on their way to Karbala, killed four people and wounded six.
Before that, officials said a suicide bomber killed three soldiers and wounding six in the town of Ana, some 330 kilometers northwest of Baghdad.
Police said another bomb blast killed two persons in a town just south of Baghdad.
In the northern city of Mosul, police said a bomb struck an outdoor market, killing two people and wounding eight.
More than 5,500 Iraqis have been killed in attacks so far this year, nearly 1,000 in October alone.