The Außerparlamentarische Opposition (German for extra-parliamentary opposition, commonly known as the APO), was a political protest movement in West Germany during the latter half of the 1960s and early 1970s, forming a central part of the German student movement. Its membership consisted mostly of young people disillusioned with the grand coalition (Große Koalition) of the Social Democratic Party of Germany (SPD) and the Christian Democratic Union (CDU). Since the coalition controlled 95 percent of the Bundestag, the APO provided a more effective outlet for student dissent. Its most prominent member and unofficial spokesman was Rudi Dutschke.
As opposed to APO, there was also opposition from other parties that, although they are represented in parliament, do not participate in the formation of the government. Small parties receive too few votes in an election to reenter the parliament. For example, in the past the Free Democratic Party (FDP) has often not been represented in Länderparlamente (federal state governments), but they are not classified as APO.
APO in Germany called primarily for the constitutional freedom of opinion, the press and assembly to convey its demands publicly. New political currents usually begin outside the parliament and usually creep over the Länderparlamente into the German Bundestag (federal parliament) or even into the Bundesregierung Deutschlands (the German federal government). For example, the Green Party entered into a coalition with the SPD (the social democratic party in Germany) in 1998, it remained in government until 2005.
The student movement began to gain strength and momentum in the middle of the 1960s in West Germany. The student movement is often used synonymously with APO, since it was at the time the most prominent form of extraparliamentary opposition in Germany. The student movement reached its peak in 1967 and 1968, especially in towns with universities. The most cited form of student-led APO was headed by the Sozialistischer Deutscher Studentenbund (the socialist German student group).