Siegen-Wittgenstein is an electoral constituency (German: Wahlkreis) represented in the Bundestag. It elects one member via first-past-the-post voting. Under the current constituency numbering system, it is designated as constituency 148. It is located in southern North Rhine-Westphalia, comprising the district of Siegen-Wittgenstein. Siegen-Wittgenstein was created for the inaugural 1949 federal election. Since 2009, it has been represented by Volkmar Klein of the Christian Democratic Union (CDU).