Sukabumi Regency is a regency (kabupaten) in southwestern Java, as part of West Java province of Indonesia. The regency seat is located in Palabuhan Ratu, a coastal district facing the Indian Ocean. The regency fully encircles the administratively separated city of Sukabumi. Covering an area of 4,164.15 km2, the regency is the largest regency in West Java and the second largest regency on Java after the Banyuwangi Regency in East Java. The regency had a population of 2,341,409 at the 2010 census and 2,725,450 at the 2020 census; the official estimate as at mid 2023 was 2,802,404, with a large proportion of it living in the northeastern part of the regency that encircles Sukabumi City, south of Mount Gede. A plan to create a new regency, the putative North Sukabumi Regency, is currently waiting for the approval of the central government, which has been deferred until the end of the current morotorium on new creations of regencies.

West Java is an Indonesian province on the western part of the island of Java, with its provincial capital in Bandung. West Java is bordered by the province of Banten and the country's capital region of Jakarta to the west, the Java Sea to the north, the province of Central Java to the east and the Indian Ocean to the south. With Banten, this province is the native homeland of the Sundanese people, the second-largest ethnic group in Indonesia.