Ansar, Al Ansar, or Al-Ansar may refer to:

• Ansar (Islam), citizens from Medina who helped Muhammad
• Ansar (Sudan), a Sufi religious movement in the Sudan

• Al-Ansar (Iraq), a Communist guerrilla group in Iraq active from 1979 to 1988
• Ansar Brigade, a Syrian rebel group
• Bangladesh Ansar, an internal security force in Bangladesh

• Ansar Burney, Pakistani-Arab human rights activist (b. 1956)

• Ansar, Hamadan, a village in Hamadan Province, Iran
• Ansar, North Khorasan, a village in North Khorasan Province, Iran
• Ansar Rural District, in West Azerbaijan Province, Iran

• Ansar, Siwan, India
• Ansar, Kazakhstan, a rural locality in Akmola Region
• Ansar, Lebanon, a village in south Lebanon

• Al Ansar FC, a Lebanese association football team
  • Al Ansar FC (women), a defunct Lebanese women's association football team
• Al Ansar Club (Libya), a Libyan association football team
• Al-Ansar FC (Medina), a Saudi Arabian association football club
• Al-Ansar (Saudi Arabia, basketball), a Saudi Arabian basketball team
• Ansar Howara SC, a Lebanese association football team
• Ansar Al Mawadda SC, a Lebanese association football team

• Anshar, also spelt Anšar, an ancient Babylonian sky god

• Ansar al-Islam, a Sunni Islamist group of Iraqis promoting a radical interpretation of Islam
• Ansar al-Sharia, a number of Islamist groups active in the Arab world
• Ansar-e Hezbollah, a militant conservative Islamic group in Iran
• Ansar al-Sunna (Mozambique), an Islamist militant group active in Cabo Delgado Province, Mozambique
• Ansar Dine, a Tuareg Islamist group, accused of having links with Al-Qaeda in the Islamic Maghreb and other Islamist groups
• Ansari (disambiguation)
• Ansaru, a Nigerian Islamist group, in conflict with the Nigerian state
• Ansarullah (Ahmadiyya), an auxiliary organization of the Ahmadiyya Muslim Community
• Anser (disambiguation)
• Jamaat Ansar al-Sunna, an Iraqi Sunni insurgent group that fought against US Troops and their local allies during the Iraq War
• Nuwaubian Nation, formerly the Ansaaru Allah Community, a black nationalist group in the US