Havelland I is an electoral constituency (German: Wahlkreis) represented in the Landtag of Brandenburg. It elects one member via first-past-the-post voting. Under the constituency numbering system, it is designated as constituency 5. It is located in the Havelland district
Geography.
The constituency includes the towns of Nauen and Ketzin, as well as the community of Brieselang and Wustermark, and the administrative divisions of Nennhausen and Friesack.
There were 49,168 eligible voters in 2024.