Oberhavel III 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 9. It is located in the Oberhavel district Geography. The constituency includes the towns of Oranienburg and Liebenwalde, as well as the municipality of Leegebruch. There were 48,358 eligible voters in 2024.