Rendsburg-Eckernförde 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 4. It is located in north central Schleswig-Holstein, comprising almost the entirety of the Rendsburg-Eckernförde district. Rendsburg-Eckernförde was created for the 1976 federal election. Since 2021, it has been represented by Sönke Rix of the Social Democratic Party (SPD).