Lumajang Regency is a Regency located in the East Java province of Indonesia. It covers an area of 1,790.90 sq. km, and had a population of 1,006,458 at the 2010 Census and 1,119,251 at the 2020 Census. The mid 2022 official estimate was originally stated to be 1,137,230, but was revised down to 1,097,504.