Banggai Sea Regency (Indonesian: Kabupaten Banggai Laut, "Marine Banggai Regency") is a regency in the province of Central Sulawesi, Indonesia. The regency was established on 14 December 2012, partitioned from the Banggai Islands Regency. It comprises the southern part of the Banggai Islands archipelago, including the main island of Banggai itself (including 40 offshore islets), the islands of Labobo and Bangkurung to the southwest of Banggai Island, and the numerous small Bokan Islands (Kepulauan Bokan) to the southeast; it does not include the larger island of Peleng to the north (between Banggai Island and the mainland of Sulawesi) which forms the Banggai Islands Regency. The new Banggai Sea Regency covers a land area of 725.67 km (and an associated marine area of 12,156.78 km), and the districts now comprising the new Regency had a population of 62,183 at the 2010 Census and 70,435 at the 2020 Census; the official population estimate at mid-2023 was 73,100 (comprising 36,900 males and 36,200 females).

The new Banggai Sea Regency is composed of seven districts (kecamatan), tabulated below with their areas and their 2010 Census and 2020 Census populations, together with the official estimates as at mid 2023. The table also includes the location of the district headquarters, the number of administrative villages in each district (in total, 63 rural desa and 3 urban kelurahan), and its postal codes.

Kode Wilayah	Name of District (kecamatan)	Area in km	Pop'n Census 2010	Pop'n Census 2020	Pop'n Estimate mid 2023	Admin centre	No. of villages	Post codes
72.11.04	Bangkurung (island)	116.55	8,196	8,928	9,160	Lantibung	12	94892
72.11.05	Labobo (island)	85.65	5,241	6,036	6,260	Mansaleang	8	94893
72.11.02	Banggai Utara (North Banggai)	58.05	6,007	7,042	7,380	Lokotoy	6	94896
72.11.01	Banggai (district)	86.95	19,977	22,591	23,430	Lompio	10	94891
72.11.07	Banggai Tengah (Central Banggai)	68.19	6,362	7,902	8,420	Adean	8	94895
72.11.06	Banggai Selatan (South Banggai)	81.20	4,809	5,803	6,130	Matanga	6	94890
72.11.03	Bokan Kepulauan (Bokan Islands)	229.08	11,571	12,133	12,310	Bungin	16	94894
	Totals	725.67	62,163	70,435	73,100		66

Notes: (a) including three kelurahan - Dodung, Lompio, and Tano Bonunungan. (b) including 10 small offshore islands. (c) including 42 small offshore islands. (d) comprising 91 islands.

Banggai has a tropical rainforest climate (Af) with moderate rainfall from September to December and heavy to very heavy rainfall from January to August.

1°35′20″S 123°30′03″E / 1.5888°S 123.5008°E / -1.5888; 123.5008