In September 2017, the United Nations Security Council unanimously adopted Resolution 2379, by which, in response to the Government of Iraq’s call for the assistance of the international community to bring members of ISIS to justice, it facilitates the establishment of the United Nations Investigative Team to Promote Accountability for Crimes Committed By Da’esh (UNITAD). UNITAD is mandated to support domestic efforts to hold ISIS accountable by collecting, preserving and storing evidence in Iraq of acts that amount to core international crimes, including war crimes, crimes against humanity and genocide. In 2018, the UN Secretary-General appointed Mr Karim Asad Ahmad Khan as Special Adviser and Head of the Team. Since then the Special Adviser has been engaged with impacted communities globally in order to strengthen the global response to ensuring accountability for international crimes committed by ISIS. After nearly three years, it is time to have a closer look at the mandates and work of the UNITAD and the see what achievements might be constituted by UNITAD for the nations of the regions, including people of Iran.