Bireuën Regency (Indonesian: Kabupaten Bireuen) is a regency of Aceh, the westernmost province of Indonesia. It is located on the island of Sumatra, and was created on 4 October 1999 from the former western districts of North Aceh Regency. The capital is the town of Bireuën, 105 miles east of the provincial capital, Banda Aceh. The regency covers an area of 1,796.97 square kilometres and had a population of 340,271 people according to the 2000 Census; at the 2010 Census it had a population of 389,288, which had risen to 436,418 at the 2020 Census; the official estimate as at mid 2023 was 453,242 - comprising 224,053 males and 229,189 females. It is bordered by the Strait of Malacca on the northeast coastline. Bireuen has been affected by the clashes between the Free Aceh Movement (GAM) and the government, and by the Indian Ocean earthquake and tsunami on 26 December 2004.

The regency's name is commonly spelled without the diaeresis on the letter Ë: Kabupaten Bireuen (in Acehnese, Ë represents a schwa ([ə]) in diphthongs).

The regency is divided administratively into seventeen districts (kecamatan), tabulated below with their areas and their populations at the 2010 Census and the 2020 Census, together with the official estimates as at mid 2023. The table also includes the locations of the district administrative centres, the number of villages (gampong) in each district, and its post code.

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 code
11.11.01	Samalanga	141.33	27,209	27,907	28,241	Samalanga	46	24264
11.11.11	Simpang Mamplam	157.81	24,470	27,237	28,222	Simpang Mamplam	41	24253
11.11.08	Pandrah	113.93	7,669	8,806	9,207	Pandrah Kandeh	19	24265
11.11.02	Jeunieb	112.49	22,309	25,244	26,282	Jeunieb	43	24263
11.11.12	Peulimbang	118.32	10,243	12,085	12,735	Peulimbang	22	24266
11.11.03	Peudada	319.60	23,996	27,839	29,194	Peudada	52	24262
11.11.09	Juli	231.09	28,738	33,731	35,493	Beunyot	36	24250
11.11.04	Jeumpa	108.99	32,189	36,930	38,603	Blang Bladeh	42	24251
11.11.13	Kota Juang (Bireuën town)	16.90	44,604	47,670	48,814	Bandar Bireuën	23	24252
11.11.14	Kuala	17.08	16,169	18,731	19,635	Cot Batee	20	24260
11.11.10	Jangka	37.71	25,698	28,687	29,749	Jangka	46	24261
11.11.05	Peusangan	59.03	47,494	52,716	54,576	Matang Glumpang Dua	69	24267
11.11.16	Peusangan Selatan (South Peusangan)	94.09	13,080	14,889	15,171	Geulanggang Labu	21	24268
11.11.15	Peusangan Siblah Krueng	111.20	10,447	11,956	12,489	Lueng Daneuen	21	24269
11.11.06	Makmur	71.69	13,887	15,656	16,282	Ulee Gle	27	24357
11.11.07	Ganda Pura	38.68	20,881	23,732	24,739	Geurugok	40	24356
11.11.17	Kuta Blang	47.04	20,205	22,602	23,453	Kuta Blang	41	24358
	Totals	1,796.97	389,288	436,418	453,242	Bandar Bireuën	609