The terror group has broken from tradition by announcing the move in a short video entitled Foundation of the Euphrates.
But the woman’s identity is not revealed because she is wearing a burka. The video shows the female jihadi wearing full-length black clothing, which is forced on women under the group’s strict interpretation of Sharia law.
It comes after the jihadis launched a women-only magazine called Majestic which is distributed to followers online and in areas under ISIS control.
However, it is believed to be the first time the group has placed a woman in such a visual role. It is thought that the video could be an attempt to recruit more women into the organisation.