Bojonegoro Regency (Indonesian: Kabupaten Bojonegoro, older spelling is Kabupaten Bodjanegara, Javanese: ꦑꦧꦸꦥꦠꦺꦤ꧀ꦨꦗꦤꦼꦒꦫ, romanized: Kabupatèn Bojånegårå) is a regency in East Java Province of Indonesia, about 110 km west of Surabaya and 73 km northeast of Ngawi. It covers a land area of 2,307.06 km (890.76 miles) and is located in the inland part of the northern Java plain, mainly on the south bank of the Solo River, the longest river in Java. It had a population of 1,209,973 at the 2010 Census and 1,301,635 at the 2020 Census; the official estimate as at mid 2024 was 1,366,227 (comprising 686,426 males and 679,801 females). The administrative centre of the regency is the town of Bojonegoro.
Previously known as a major producer of teak and tobacco, Bojonegoro is a focus of attention in Indonesia as a new oil field has been found in this area. This oil find is the biggest oil discovery in Indonesia in three decades and one of the biggest reserves in Indonesia.
