Banyuasin (Musi: Ayomasen) is a regency of South Sumatra Province in Indonesia. The Regency was formed on 10 April 2002 from the coastal and eastern areas formerly part of the Musi Banyuasin Regency. It takes its name from the main river which drains that area, the Banyuasin River. Pangkalan Balai is the regency seat. The regency borders Musi Banyuasin Regency, Jambi province and Bangka Strait to the north, Bangka Strait to the east, Ogan Komering Ilir Regency, Muara Enim Regency, and the city of Palembang (which it almost surrounds on most sides) to the south, and Musi Banyuasin Regency to the west. It has an area of 12,551.15 km and had a population of 749,107 at the 2010 census and 836,914 at the 2020 census; the official estimate as at mid 2023 was 850,022 (comprising 434,753 males and 415,269 females). Much of the regency is coastal lowland.

As at 2010, the Banyuasin Regency was subdivided into fifteen districts (kecamatan), subsequently increased by six to twenty-one districts which are listed below with their areas and their populations at the 2010 and 2020 censuses, together with the official estimates as at mid 2023. The table also includes the location of the district administrative centres, the number of administrative villages in each district (totaling 287 rural desa and 17 urban kelurahan), and its post code.

Kode Wilayah	Name of District (kecamatan)	Area in km	Pop'n 2010 census	Pop'n 2020 census	Pop'n mid 2023 estimate	Admin centre	No. of villages	Post code
16.07.11	Rantau Bayur *	535.07	38,319	41,390	40,257	Tebing Abang	21	30968
16.07.05	Betung	388.99	55,922	54,750	55,129	Betung	11	30958
16.07.16	Suak Tapeh	322.51		18,960	19,351	Lubuk Lancang	11	30957
16.07.04	Pulau Rimau	503.94	38,454	21,360	24,398	Teluk Betung	17	30959
16.07.15	Tungkal Ilir	686.30	23,281	28,810	27,976	Sido Mulyo	14	30956
16.07.21	Selat Penuguan	136.39		22,670	22,825	Wonodadi	12	30959
16.07.05	Banyuasin III *	679.36	86,183	66,420	68,804	Pangkalan Balai	26	30953
16.07.17	Sembawa	220.32		32,290	33,807	Sembawa	11	30953
16.07.10	Talung Kelapa *	478.85	123,192	150,976	153,662	Sukajadi	12	30961
16.07.12	Tanjung Lago	533.22	35,687	40,460	42,208	Tanjung Lado	15	30960
16.07.01	Banyuasin I *	214.70	69,860	54,380	57,244	Mariana	13	30963
16.07.19	Air Kumbang	343.43		26,076	28,013	Cinta Manis Baru	16	30962
16.07.06	Rambutan *	586.82	41,953	45,592	43,621	Rambutan	20	30967
16.07.07	Muara Padang	945.21	25,198	31,890	31,587	Muara Padang	15	30975
16.07.13	Muara Sugihan	679.41	36,971	38,210	39,134	Tirta Harja	22	30976
16.07.09	Makarti Jaya	327.17	32,819	25,450	23,065	Makarti Jaya	12	30972
16.07.14	Air Saleh	338.68	28,858	34,920	35,019	Saleh Mukti	14	30973
16.07.02	Banyuasin II	3,611.53	45,072	29,267	28,294	Sungsang I	10	30971
16.07.20	Karang Agung Ilir	437.69		11,410	11,803	Jati Sari	7	30971
16.07.08	Muara Telang	364.16	52,783	37,580	39,590	Telang Jaya	16	30974
16.07.18	Sumber Marga Telang	217.38		24,050	24,235	Muara Telang	10	30977
	Totals	12,551.15	749,107	836,914	850,022	Pangkalan Balai	304

Notes: (a) includes 2 kelurahan (Betung and Rimba Asam).
(b) 2010 population included in figure for Betung and Banyuasin III Districts, from parts of which it was created in 2011.
(c) 2010 population included in figure for Pulau Rimau District, from part of which it was created.
(d) comprises 5 kelurahan (Kayuara Kuning, Kedondong Raye, Mulya Agung, Pangkalan Balai and Seterio) and 21 desa.
(e) except for the villages of Pangkalan Balai (which has a postcode of 30911), Seterio (30912), Sukaraja Baru (30913), Mulya Agung (30914), Kayuara Kuning (30915) and Sukamulya (30916).
(f) 2010 population included in figure for Banyuasin III District, from part of which it was created in 2011.
(g) comprises 6 kelurahan (Air Batu, Kenten, Sukajadi, Sukomoro, Talang Keramat and Tanah Mas) and 6 desa.
(h) includes 2 kelurahan (Mariana and Mariana Ilir).
(i) 2010 population included in figure for Banyuasin I and Rambutan Districts, from parts of which it was created in 2012.
(j) includes one kelurahan (Jakabaring Selatan). (k) includes one kelurahan (Makarti Jaya).
(l) 2010 population included in figure for Banyuasin II District, from part of which it was created.
(m) 2010 population included in figure for Muara Telang District, from part of which it was created in 2016.

Five of the above districts, indicated by an asterisk (*) following their name in the first column, are immediately adjacent to Palembang City with suburbs of that city, and form part of the Palembang metropolitan area.

Of the Regency's 16 kelurahan, 6 are in Talang Kelapa District, 5 in Banyuasin III District, 2 each in Betung District and Banyuasin I District, and 1 each in Rambutan District and Makarti Jaya District. Average land area of all 288 desa is 43.58 km (16.83 sq mi)

2°53′00″S 104°22′59″E / 2.88333°S 104.38306°E / -2.88333; 104.38306