Bojonegoro Regency is a regency located in the East Java Province of Indonesia. It is situated in the inland portion of the northern Java plain, primarily along the south bank of the Solo River, which is the longest river on the island of Java. The region covers a total land area of 2,307.06 km².
The administrative center of the regency is the town of Bojonegoro. Geographically, it is positioned approximately 110 km west of Surabaya and 73 km northeast of Ngawi. As of mid-2024, the official population estimate for the regency is 1,366,227.