The violence, in restive Diyala province and an area known as the "Triangle of Death", is the latest in a surge in unrest that has left more than 4,000 people dead so far this year.
Authorities have sought to tackle the country's worst unrest since 2008 with wide-ranging operations targeting militants as well as tight traffic measures in the capital, but attacks have continued to rock many cities.
In today's deadliest attack, gunmen stormed a house in the town of Yusufiyah and killed six people, including two women, as they were ritually cleansing the body of a Sunni Arab man ahead of his funeral, a police officer and a doctor at a nearby hospital said.
Two more people were killed and seven others were wounded in the nearby town of Latifiyah by a roadside bomb near a cafe
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Yusufiyah and Latifiyah lie within a confessionally-mixed region south of Baghdad known as the "Triangle of Death" for the brutal violence in the area at the peak of Iraq's sectarian war.
Latifiyah in particular has seen a spike in bloodletting in recent weeks, including separate early morning attacks by gunmen on two families.
Elsewhere today, three separate car bombs near Baquba, north of Baghdad and capital of restive Diyala province, left eight people dead and dozens wounded, security and medical officials said.
Violence has surged in Iraq, with more than 4,000 people killed since the beginning of 2013, according to an AFP tally.
The spike in bloodletting has sparked concerns Iraq is slipping back towards the all-out sectarian war that engulfed it in 2006 and 2007.
But the government has faced criticism for not doing more to defuse anger in the Sunni Arab community over alleged ill treatment at the hands of the Shiite-led authorities.