Lebak Regency is a regency of Banten province, Indonesia. It is located on the island of Java. The regency has an area of 3,312.18 km2 and had a population of 1,204,095 at the 2010 census and 1,386,793 at the 2020 census; the official estimate as at mid 2023 was 1,433,698 - comprising 737,148 males and 696,550 females. The town of Rangkasbitung in the north of the regency is the administrative centre. The regency is bordered by Pandeglang Regency to the west, Serang Regency to the north, and Tangerang Regency to the north-east, and by the Bogor and Sukabumi regencies to the east.

Banten is the westernmost province on the island of Java, Indonesia. Its capital city is Serang and its largest city is Tangerang. The province borders West Java and the Special Capital Region of Jakarta on the east, the Java Sea on the north, the Indian Ocean on the south, and the Sunda Strait on the west and shares a maritime border with Bengkulu and Lampung to the east and Bangka Belitung Islands to the north. The province covers an area of 9,352.77 km2 (3,611.12 sq mi). It had a population of over 11.9 million in the 2020 census, up from about 10.6 million in 2010. The estimated mid-2023 population was 12.308 million. Formerly part of the province of West Java, Banten was split off to become a province on 17 October 2000.