The United Nations Interim Force in Lebanon, or UNIFIL, was created by the United Nations, with the adoption of Security Council Resolution 425 and 426 on March 19, 1978, to confirm Israeli withdrawal from Lebanon, restore international peace and security, and help the Government of Lebanon restore its effective authority in the area. The first UNIFIL troops were deployed in the area on March 23, 1978; these troops were reassigned from other UN peacekeeping operations in the area (namely the United Nations Emergency Force and the United Nations Disengagement Observer Force Zone).

Prior to the 1982 Lebanon War on 2 January 1982, in which two Ghanaian soldiers guarding a UNIFIL position were attacked by unidentified persons and one of the soldiers was shot and subsequently died. During the 1982 Lebanon War, UN positions were overrun, primarily by the SLA forces under Saad Haddad. This was the Lebanese collaborator forces supported by the IDF. During the occupation, UNIFIL’s function was mainly to provide humanitarian aid. Beginning in 1985, Israel scaled back its permanent positions in Lebanon, although this process was punctuated by brief invasions and bombings, as in Operation Accountability in 1993 and Operation Grapes of Wrath in 1996. In 1999, Israel undertook a withdrawal, which concluded in 2000 and enabled UNIFIL to resume its military tasks. The Lebanese government claims that the Shebaa farms area is Lebanese territory, although the UN considers it to be Syrian territory under Israeli military occupation. They contend that this dispute gives continued legal sanction to armed anti-Israeli groups in Lebanon (though the UN has officially certified that Israel has fully withdrawn from all areas it occupied after 1973).

Many countries including Malaysia contributes at least military and police to this mission.