The older sister of slain ISIS leader Abu Bakr al-Baghdadi was captured by Turkish forces on Monday in northwestern Syria, according to a senior Turkish official.

Rasmiya Awad, 65, was nabbed with her family on a trailer container near the town of Azaz in a region of Syria occupied by Turkey.

The Turkish official called Awad’s arrest an intelligence “gold mine.”

Awad was found with her husband, daughter-in-law and five children. Authorities are interrogating the adults.

Awad’s brother died less than two weeks ago during a US raid of al-Baghdadi’s nearby Syrian compound.

The former ISIS leader blew himself up inside a tunnel, using a suicide vest, as US forces close in on him.

Last Thursday, ISIS reportedly announced that it has tapped Abu Ibrahim Hashimi al-Quraishi — aka Abdullah Qardash — as al-Baghdadi’s successor.

Reports differed on whether that person is the same as brutal ISIS enforcer and long-presumed successor Abdullah “The Destroyer” Qardash.

With Post wires