UN deputy spokesman Farhan Haq said today the peacekeeper was missing after last Thursday's attack on the camp east of the city of Kidal and his body was found on Saturday.
SITE Intelligence Group, which monitors terror groups, said al-Qaida's affiliate in Mali claimed responsibility.
Haq said eight peacekeepers injured in the attack have been treated in the UN hospital in Kidal and are in stable condition.
He said the United Nations extends condolences to the victims' families and to the government and people of Guinea.