Ayyub Faleh al-Rubaie, known by his nom de guerre Abu Azrael (Arabic: ابو عزرائيل‎‎, literally "Father of Azrael"), also known as the "Angel of Death", is a commander of the Kataib al-Imam Ali, an Iraqi Shi'a militia group of the Popular Mobilization Forces that is fighting ISIL/ISIS (Islamic State of Iraq and the Levant) in Iraq. He has become a public icon of resisting ISIL in Iraq among Shia Iraqis with a large following on social media. His motto and catchphrase is "illa tahin" (إلى طحين), meaning "Grind you to dust", that is, he would pulverize ISIL militants until nothing remains of them but powder.

He was a former militia member in Muqtada al-Sadr's Mahdi Army which fought against the United States during the U.S.-led invasion of Iraq.