Shootings and bombings in Baghdad and north of the capital killed three people on Monday, including a policeman, security and medical officials said.
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And in restive Diyala province, gunmen opened fire on a police checkpoint in the town of Buhruz, killing police First Lieutenant Mohammed Haidar and wounding four other police officers, according to an army officer and a doctor at the main hospital in provincial capital Baquba.
In the main northern city of Mosul, gunmen shot dead local imam Sheikh Mohammed al-Juburi, police First Lieutenant Mohi Waagha and doctor Khalil Hamdan at the city's hospital said.
The violence comes amid a spike in attacks in Iraq, with the country suffering a wave of unrest in June that left at least 282 people dead according to an AFP tally, though government figures said 131 Iraqis died.
While violence in Iraq has declined dramatically since its peak in 2006-2007, attacks remain common across the country.