Ansar ul Islam or Ansar al-Islam (; "Partisans of Islam" or "Helpers of Islam") may refer to:
*
Ansar al-Islam in Kurdistan, a Kurdish Salafist group in Northern Iraq.
*
Jama'at Ansar al-Islam, a Kurdish-dominated Salafist group in Iraq and Syria.
*
Ansar al-Islam (Bangladesh) also called ''Ansarullah Bangla Team'', a radical islamist group in Bangladesh.
*
Ansar ul-Islam (Pakistan), a Barelvi Sunni Muslim group in the Khyber Agency, Federally Administered Tribal Areas, Pakistan.
*
Ansarul Islam (Kashmir), founded in 1983 and merged into Hizbul Mujahideen in 1989.
*
Ansarul Islam (Sahel), an organization in Burkina Faso and Mali.
*
Jabhat Ansar al-Islam, Syrian rebel group.
* Ansar-ul-Hussain, a Parachinar-based banned Shia Pakistani terrorist group, responsible for recruiting fighters for Liwa Zainebiyoun.
{{Military unit disambiguation