Jassim Mohammed Ghani, director-general of Iraq's Foreign Ministry, was killed on Saturday evening in western Baghdad's Jihad district in a drive-by shooting, Iraqi police Captain Talib Thamer said.
Three civilians were wounded in the attack, Aljazeera learned.
Officials at the Foreign Ministry were not immediately available for comment.
Iraqi government officials have been targeted in a campaign to derail the country's postwar reconstruction efforts.
Three Iraqi soldiers were gunned down on Saturday evening in a drive-by shooting on their convoy in western Baghdad, an Interior Ministry official said.
The attack comes after four people were killed and 10 wounded in the afternoon in a car bomb blast in which the attacker killed himself.
Three civilians were killed and four wounded by another bomb explosion in the south of the capital earlier on Saturday.