The United Nations Interim Force in Lebanon, or UNIFIL, is a UN peacekeeping mission established on 19 March 1978 by United Nations Security Council Resolutions 425 and 426, to confirm Israeli withdrawal from Lebanon which Israel had invaded five days prior, in order to ensure that the government of Lebanon would restore its effective authority in the area. The 1978 South Lebanon conflict came in the context of Palestinian insurgency in South Lebanon and the Lebanese Civil War.

United Nations Security Council Resolution 425, adopted on 19 March 1978, five days after the Israeli invasion of Lebanon in the context of Palestinian insurgency in South Lebanon and the Lebanese Civil War, called on Israel to withdraw immediately its forces from Lebanon and established the United Nations Interim Force In Lebanon (UNIFIL). It was adopted by 12 votes to none; Czechoslovakia and the Soviet Union abstained, and China did not participate.