Vienna (German: Wien), also known as Electoral District 9 (German: Wahlkreis 9), is one of the nine multi-member state electoral districts of the National Council, the lower house of the Austrian Parliament, the national legislature of Austria.

[4][5] In 1934 the rump National Council (Rumpfnationalrat), controlled by the fascist Christian Social Party as the Social Democratic Workers' Party had been banned, imposed the May constitution (Maiverfassung) which replaced the democratic First Austrian Republic with the corporate authoritarian Federal State of Austria.

[10] The number of seats allocated to Electoral Union I was reduced to 38 in May 1962 based on the population as at the 1961 national census.

[11] The "National Council Election Regulations 1971" (Nationalrats-Wahlordnung 1971) passed by the National Council in November 1970 replaced the lower tier electoral districts with nine state electoral districts (landeswahlkreise) conterminous with the nine states of Austria.

[12] The newly created Vienna electoral district was initially allocated 42 seats in January 1971.

[13] The number of seats allocated to Vienna was reduced to 39 in February 1972 based on the population as at the 1971 national census.

[14] The number of seats allocated to Vienna was reduced to 35 in February 1982 based on the population as at the 1981 national census.

[20] The number of seats allocated to Vienna was reduced to 33 in September 2002 based on the population as at the 2001 national census.

[21] 1994 to date Vienna currently elects 33 of the 183 members of the National Council using the open party-list proportional representation electoral system.

[26][27] Electors may cast one preferential vote for individual candidates at the regional, state and federal levels.

In the first stage, seats were allocated to parties at the district level using the Droop quota (also known as the Hagenbach-Bischoff method).