This article gives an overview of the principles regulating the use of force under the Islamic law of war in the four Sunni schools of Islamic law. By way of introducing the topic, it briefly discusses the origins, sources and characteristics of the Islamic law of war. The discussion reveals the degree of compatibility between these Islamic principles and the modern principles of international humanitarian law, and offers insights into how these Islamic principles can help in limiting the devastation and suffering caused by contemporary armed conflicts in Muslim contexts, particularly those conflicts in which Islamic law is invoked as the source of reference.