Thirty-six members of the Yazidi religious minority are free after nearly three years in the hands of so-called Islamic State (IS), the UN says.
They have been taken to UN centres in Dohuk in Kurdish northern Iraq.
It is unclear whether they escaped in Iraq or were freed, as the UN declined to give more information to avoid jeopardising future releases.
IS killed and enslaved thousands of Yazidis after seizing the northern town of Sinjar in 2014.
Kurdish Peshmerga forces regained control in 2015 but many Yazidis were held captive by IS elsewhere as the group took over large swathes of northern Iraq.
The 36 survivors include men, women and children who were enslaved, the UN Office for the Co-ordination of Humanitarian Affairs said.