The bomber detonated an explosives-rigged vehicle near a funeral tent in the village of Zahra, north of Baghdad, where family members of a deceased Shiite man were receiving condolences.
Five people were killed and 10 wounded, two days after a copycat attack in nearby Muqdadiyah killed 10 mourners.
Sunni militants including those linked to Al-Qaeda frequently target members of the Shiite majority, whom they regard as apostates.
Iraq has been hit by a surge in violence that has killed more than 2,500 people have been killed this year, including over 310 this month alone.
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Also today, a roadside bomb in a Shiite area of Muqdadiyah killed two people and wounded five, while another exploded when people gathered at the scene, wounding four more.
In Baquba, north of the capital, gunmen killed a shopowner, while others shot dead an army officer in the northern city of Mosul.
And gunmen killed a soldier and wounded another in Kirkuk, also in northern Iraq.
Gunmen also crossed into western Iraq from Syria today and clashed with border police, leaving one dead and five wounded.