Map - Serang Regency (Kabupaten Serang)

Serang Regency (Sundanese: ) is a regency of Banten province, Indonesia. It is located in the northwest corner of the island of Java. The administrative center of the regency is at Ciruas, while the capital of the province is the independent municipality of Serang (Kota Serang) which was split off the regency in 2007.

Serang municipality is about 10 km from Old Banten, the eponymous former sultanate's capital. Merak, a major port and ferry terminal, is located at the northwest tip of Java, within the independent municipality of Cilegon. Serang Regency and its capital have experienced a heavy influx of residents as Jakarta continues its outward growth; some planning agencies consider it to be part of the metropolitan area. It shares its eastern border with Tangerang Regency of Jabodetabek.

Serang Regency covers an area of 1,467.35 km2, and had a population of 1,402,818 at the 2010 Census and 1,622,630 at the 2020 Census. Including Cilegon and Serang cities which the regency surrounds on their landward sides, the 2020 population amounted to 2,749,627 inhabiting 1,909.56 km2, for an overall density of 1,440 per km2. Cilegon and Serang Cities are semi-enclaves within Serang Regency.

Serang Regency is bounded by Java Sea to the north, Sunda Strait to the west, Tangerang Regency of Greater Jakarta to the east, Lebak Regency and Pandeglang Regency to the south.

As at time of the 2010 Census, the Regency was divided into twenty-eight districts (kecamatan). However, an additional district - Lebak Wangi - has been created since 2010 from the southeastern part of Pontang District and other neighbouring districts. The districts are tabulated below with their current areas and their populations at the 2010 Census and the 2020 Census. The districts are subdivided into 326 'villages' (desa and kelurahan).

Note: (a) the 2010 population on the new Lebak Wangi District is included in the figures for the districts from which it was cut out.