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, approximately 110 km west of Surabaya and 73 km northeast of Ngawi. The administrative center of the regency is the town of Bojonegoro.
The region covers a land area of 2,307.06 km² and is primarily positioned on the south bank of the Solo River, which is recognized as the longest river in Java. As of mid-2024, the official population estimate for the regency is 1,366,227.