Ansar ul-Islam was a Barelvi Sunni Islamist militant group which operated in North-west Pakistan. It was founded in 2004 by Pir Saif-ur Rehman, an Afghan Sufi preacher, influenced by the Barelvi movement of Sunni Islam. The group was a rival to Lashkar-e-Islam.
By 2013n the group was being led by Qazi Mehboob-ul-Haq.
The group was banned by the Pakistani government in June 2008, and the ban was renewed in Pakistan's 2014 National Internal Security Policy.