Dar al-Islam or Darul Islam (Arabic: دار الإسلام, literally 'house/abode of Islam')
- Dar al-islam, an Islamic term for the Muslim regions of the world
- Dar es Salaam, the largest city in Tanzania
- Dar al-Islam (organization), a small non-profit organization based in New Mexico, United States
- Dar al-Islam (magazine), a French-language magazine self-published by the Islamic terrorist organization ISIL/ISIS/IS/Daesh
- Darul Islam (Indonesia), an Islamist group responsible for an insurgency against the Indonesian government during the 1950s and 1960s
- Darul Islam (Nigeria), an Islamic organization based in Nigeria
- Darul Islam (United States), a Black Muslim religious group based in the United States
- Darul Islam (political movement), a political movement led by Niaz Ali Khan around 1940 to separate Pakistan as a Muslim state from India
Mosques
- Daar-Ul-Islam, Saint Louis, a mosque located in Missouri, United States