Tulungagung Regency is a regency of East Java Province, Indonesia. It covers an area of 1,144.53 km2 and had a population of 990,159 at the 2010 Census and 1,089,775 at the 2020 Census; the official estimate as of mid-2023 was 1,132,144. The administrative headquarters is in the town of Tulungagung.