Ahmad ibn Umar al-Hazimi () is a Saudi Arabian Salafi scholar whose interpretation of "takfir" (excommunication) gave rise to the eponymous Hazimi branch of Wahhabism. A relatively unknown figure until he publicised his teachings in Tunisia after the 2011 revolution, followers of al-Hazimi's views briefly wielded considerable power within the Islamic State of Iraq and the Levant (ISIS). He was arrested and imprisoned by Saudi authorities in 2015.