The Berlin Wall (German: Berliner Mauer) was a barrier constructed by the German Democratic Republic (GDR, East Germany) starting on 13 August 1961, that completely cut off West Berlin from surrounding East Germany and from East Berlin. The barrier included guard towers placed along large concrete walls, which circumscribed a wide area (later known as the "death strip") that contained anti-vehicle trenches, "fakir beds" and other defenses. The Soviet-dominated Eastern Bloc officially claimed that the wall was erected to protect its population from fascist elements conspiring to prevent the "will of the people" in building a socialist state in East Germany. However, in practice, the Wall served to prevent the massive emigration and defection that marked Germany and the communist Eastern Bloc during the post-World War II period.

The Berlin Wall was officially referred to as the "Anti-Fascist Protection Rampart" (German: Antifaschistischer Schutzwall) by GDR authorities, implying that neighbouring West Germany had not been fully de-Nazified. The West Berlin city government sometimes referred to it as the "Wall of Shame"—a term coined by mayor Willy Brandt—while condemning the Wall's restriction on freedom of movement. Along with the separate and much longer Inner German border (IGB) that demarcated the border between East and West Germany, both borders came to symbolize the "Iron Curtain" between Western Europe and the Eastern Bloc.

Before the Wall's erection, 3.5 million East Germans circumvented Eastern Bloc emigration restrictions and defected from the GDR, many by crossing over the border from East Berlin into West Berlin, from where they could then travel to West Germany and other Western European countries. Between 1961 and 1989, the wall prevented almost all such emigration. During this period, around 5,000 people attempted to escape over the wall, with estimates of the resulting death toll varying between 100 and 200.

After allowing for loopholes throughout the summer, Hungary effectively disabled its physical border defenses with Austria on 19 August 1989 and, in September, more than 13,000 East German tourists escaped through Hungary to Austria. This set up a chain of events. The Hungarians prevented many more East Germans from crossing the border and returned them to Budapest. These East Germans flooded the West German embassy and refused to return to East Germany. The East German government responded by disallowing any further travel to Hungary, but allowed those already there to return. This triggered a similar incident in neighboring Czechoslovakia. On this occasion, the East German authorities allowed them to leave, providing that they used a train which transited East Germany on the way. This was followed by mass demonstrations within East Germany itself. (See Monday demonstrations in East Germany.) The longtime leader of East Germany, Erich Honecker, resigned on 18 October 1989 and was replaced by Egon Krenz a few days later. Honecker had predicted in January of that year that the wall would stand for a 50 or 100 more years[64] if the conditions that had caused its construction did not change. Protest demonstrations broke out all over East Germany in September 1989. Initially, protesters were mostly people wanting to leave to the West, chanting "Wir wollen raus!" ("We want out!"). Then protestors began to chant "Wir bleiben hier", ("We're staying here!"). This was the start of what East Germans generally call the "Peaceful Revolution" of late 1989. The protest demonstrations grew considerably by early November. The movement neared its height on 4 November when half a million people gathered at the Alexanderplatz demonstration, a rally for change in East Berlin's large public square and transportation hub.

The date on which the Wall fell is considered to have been 9 November 1989 but the Wall in its entirety was not torn down immediately. Starting that evening and in the days and weeks that followed, people came to the wall with sledgehammers or otherwise hammers and chisels to chip off souvenirs, demolishing lengthy parts of it in the process and creating several unofficial border crossings. These people were nicknamed "Mauerspechte" (wall woodpeckers). The East German regime announced the opening of ten new border crossings the following weekend, including some in historically significant locations (Potsdamer Platz, Glienicker Brücke, Bernauer Straße). Crowds on both sides waited there for hours, cheering at the bulldozers which took parts of the Wall away to reinstate old roads. Photos and television footage of these events is sometimes mislabelled "dismantling of the Wall", even though it was merely the construction of new crossings. New border crossings continued to be opened through the middle of 1990, including the Brandenburg Gate on 22 December 1989.

West Germans and West Berliners were allowed visa-free travel starting 23 December. Until then, they could only visit East Germany and East Berlin under restrictive conditions that involved application for a visa several days or weeks in advance and obligatory exchange of at least 25 DM per day of their planned stay, all of which hindered spontaneous visits. Thus, in the weeks between 9 November and 23 December, East Germans could actually travel more freely than Westerners.

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