The latest violence, just months ahead of landmark elections, pushed the number of slain so far this year above 6,000 as the country endures its worst prolonged spate of bloodshed since 2008, AFP reported.
Although there have been no claims of responsibility for much of the unrest, authorities are concerned about a resurgent al-Qaeda, emboldened by the civil war raging in neighboring Syria.
Most of the violence on Wednesday struck Baghdad and northern and western Iraq, which have borne the brunt of the months-long spike in bloodletting.
Four suicide bombers detonated their explosives, but the carnage could have been much worse because security forces shot dead several would-be suicide attackers.
Meanwhile, in two separate areas of the capital, police found the bodies of 14 men, all in their 20s or 30s, and all shot dead, medical officials said.
Eight of the corpses were found blindfolded in the Dura neighborhood, while six others had been dumped in a canal in Shuala.
In the northern district of Hurriyah, a family of five -- three men and two women -- were shot dead in their home in a pre-dawn attack.
Shootings, bombings and mortar fire in various other parts of the capital left five others dead Wednesday.
Elsewhere, shootings and bombings -- including four suicide attacks -- killed 25 people.
In Abu Ghraib, west of Baghdad, a man blew himself up in the middle of a funeral, killing nine people.
In northern Diyala province, a vehicle rigged with explosives and detonated by a suicide attacker killed three members of Kurdish peshmerga forces.
Two separate attacks involving multiple suicide bombers against police near Ramadi, west of Baghdad, killed at least seven policemen and left 15 others wounded.
One of the attacks involved a car bomb set off by a suicide attacker on the western outskirts of the city, followed by a firefight between militants and police in which four suicide bombers blew themselves up.
Five policemen were killed and 11 were wounded.
A separate suicide bombing at a police station just north of the city killed two more policemen and left four wounded.
Shootings in and around Mosul left five people dead, and an anti-Qaeda militiaman was gunned down in Salaheddin province.
The government has trumpeted wide-ranging security operations targeting militants, primarily in the north and west, including the arrest of 25 people on Wednesday, but daily attacks have shown no sign of abating.
More than 6,000 people have been killed so far this year, according to an AFP tally based on reports from security and medical officials.
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