The Blue Line is a demarcation line dividing Lebanon from Israel and the Golan Heights. It was published by the United Nations on 7 June 2000 for the purposes of determining whether Israel had fully withdrawn from Lebanon. It has been described as: "temporary" and "not a border, but a “line of withdrawal”. It is the subject of an ongoing border dispute between Israel, Lebanon, and Hezbollah.

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.