Delmenhorst – Wesermarsch – Oldenburg-Land 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 28. It is located in northwestern Lower Saxony, comprising the city of Delmenhorst and the districts of Wesermarsch and Landkreis Oldenburg. Delmenhorst – Wesermarsch – Oldenburg-Land was created for the inaugural 1949 federal election. Since 2021, it has been represented by Susanne Mittag of the Social Democratic Party (SPD).