Kitasaku (北佐久郡, Kitasaku-gun?) is a district located in Nagano Prefecture, Japan.
As of December 1, 2005, the district has an estimated population of 40,041.
The district has three towns
Coordinates: 36°21′11″N 138°33′07″E / 36.353°N 138.552°E / 36.353; 138.552