The Green Line, (pre-)1967 border, or 1949 Armistice border, is the demarcation line set out in the 1949 Armistice Agreements between the armies of Israel and those of its neighbors (Egypt, Jordan, Lebanon and Syria) after the 1948 Arab–Israeli War. It served as the de facto borders of the State of Israel from 1949 until the Six-Day War in 1967.

The Green Line was intended as a demarcation line rather than a permanent border. The 1949 Armistice Agreements were clear (at Arab insistence) that they were not creating permanent borders. The Egyptian–Israeli agreement, for example, stated that "the Armistice Demarcation Line is not to be construed in any sense as a political or territorial boundary, and is delineated without prejudice to rights, claims and positions of either Party to the Armistice as regards ultimate settlement of the Palestine question." Similar provisions are contained in the Armistice Agreements with Jordan and Syria. The Agreement with Lebanon contained no such provisions, and was treated as the international border between Israel and Lebanon, stipulating only that forces would be withdrawn to the Israel–Lebanon border.

The Green Line is often referred to as the "pre-1967 borders" or the "1967 borders" by many international bodies and national leaders, including the former United States president (Barack Obama), Palestinian president Mahmoud Abbas, by the United Nations (UN) in informal texts, and in the text of UN General Assembly Resolutions. The name comes from the green ink used to draw the line on the map while the armistice talks were going on. After the Six-Day War, the territories captured by Israel beyond the Green Line came to be designated as East Jerusalem, the West Bank, Gaza Strip, Golan Heights, and Sinai Peninsula (the Sinai Peninsula has since been returned to Egypt as part of the 1979 peace treaty). These territories are often referred to as Israeli-occupied territories.