Nganjuk Regency is a regency located in the East Java Province of Indonesia. It covers a total area of 1,288.91 square kilometers and serves as an administrative region within the province. The town of Nganjuk functions as the official administrative center for the regency.
The regency is bordered by Bojonegoro Regency to the north, Jombang Regency to the east, Kediri Regency to the south, and Madiun Regency to the west. As of the 2020 Census, the population was recorded at 1,103,902, with a mid-2024 estimate reaching approximately 1,148,611 residents.