ISIL is the Islamic State of Iraq and the Levant (self-styled "Islamic State"), a militant Islamic group operating primarily in Iraq and Syria.
ISIL or Isil may also refer to:
Identifiers International Standard Identifier for Libraries and Related Organizations, a standard for identifying organizations
Organizations International Society for Individual Liberty, now known as Liberty International, a libertarian educational organization based in the United States Indian Society of International Law, an institution for the teaching, research and promotion of International Law in India
Other uses Işıl, a feminine Turkish given name Information Structure Identification Language, based on GML
See also ISIL-KP, or the Islamic State of Iraq and the Levant – Khorasan Province, an offshoot of the ISIL operating primarily in Afghanistan and South Asia