Biržai District Municipality is a Lithuanian municipality, located in northern Lithuania, Aukštaitija ethnographic region, Panevėžys County.
The towns of Biržai and Vabalninkas lie within the district. About 64% of its land is agricultural, including a number of organic farms. Portions are protected in Biržai Regional Park and as botanical and geological reserves.
Biržai District Municipality hosts 8 elderates:
Biggest population (2001):