Nganjuk Regency is a regency(kabupaten) of East Java Province, Indonesia. It bordered Bojonegoro Regency in the north, Jombang Regency in the east, Kediri Regency in the south, and Madiun Regency in the west. It covers an area of 1,224.25 sq. km, and had a population of 1,017,030 at the 2010 Census; the latest official estimate (as at 2014) is 1,045,598. The administrative centre of the regency is the town of Sombron. The current regent is Brian Baihaki.