Rotenburg I – Heidekreis 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 35. It is located in northern Lower Saxony, comprising the Heidekreis district and the southern part of the Rotenburg district. Rotenburg I – Heidekreis was created for the 1980 federal election. It was abolished in 2002 and re-established in the 2009 federal election. Since 2017, it has been represented by Lars Klingbeil of the Social Democratic Party (SPD).