Lower Austria Centre (German: Niederösterreich Mitte), also known as Electoral District 3D (German: Wahlkreis 3D), is one of the 39 multi-member regional electoral districts of the National Council, the lower house of the Austrian Parliament, the national legislature of Austria.

[7] As a result, the number of seats allocated to Lower Austria Centre was increased to seven in February 2017.

[8] Lower Austria Centre currently elects seven of the 183 members of the National Council using the open party-list proportional representation electoral system.

[13][14] Electors may cast one preferential vote for individual candidates at the regional, state and federal levels.

[14][15] At the regional level, candidates must receive preferential votes amounting to at least 14% of the valid votes cast for their party to over-ride the order of the party list (10% and 7% respectively for the state and federal levels).