The car bomb ripped into a funeral tent in Muqdadiyah, northeast of Baghdad, where family members were receiving condolences, and a suicide bomber then detonated explosives after emergency personnel arrived.
Sunni militants including those linked to Al-Qaeda frequently target members of the Iraq's Shiite majority, whom they regard as apostates.
Iraq was plagued by sectarian violence that killed tens of thousands of people in past years, and there are persistent fears that tensions will again boil over into all-out conflict.