Langkat Regency (Indonesian: Kabupaten Langkat) is the northernmost regency of North Sumatra Province in Indonesia. Its administrative centre is the town of Stabat. It has a land area of 6,263.29 km and its population was 967,535 at the 2010 Census and 1,030,202 at the 2020 Census; the official estimate as at mid 2023 was 1,066,711 - comprising 538,822 males and 527,889 females. Its population is roughly equivalent to that of Djibouti.

Immediately to the south is Karo Regency, to the east is Deli Serdang Regency (which surrounds the city of Medan) and the city of Binjai (formerly part of Langkat Regency), to the northeast lies the Strait of Malacca and to the west lies Aceh Province.

Langkat Regency is divided into twenty-three administrative districts (Indonesian: 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 administrative villages in each district (totaling 240 rural desa and 37 urban kelurahan), 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 kelu- rahan	No. of desa	Post code
12.05.01	Bahorok	1,101.83	39,851	41,570	42,730	Pekan Bahorok	1	18	20774
12.05.21	Sirapit	98.50	15,908	16,703	17,202	Sidorejo	-	10	20775
12.05.02	Salapian	221.73	25,924	26,238	26,735	Minta Kasih	1	16	20777
12.05.22	Kutambaru	236.84	13,425	14,109	14,534	Kutambaru	-	8	20773
12.05.04	Sei Bingai	333.17	48,346	51,617	53,417	Namu Ukur	1	15	20771
12.05.03	Kuala	206.23	39,125	40,327	41,309	Pekan Kuala	2	14	20772
12.05.06	Selesai	167.73	69,324	72,595	75,833	Pekan Selesai	1	13	20762
12.05.05	Binjai	42.05	42,325	47,018	49,217	Kuala Begumit	1	6	20761
12.05.07	Stabat	108.85	81,971	91,153	95,448	Stabat Binjai	6	6	20811 -20816
12.05.08	Wampu	194.21	40,612	42,388	43,578	Bingai	1	13	20851
12.05.19	Batang Serangan	899.38	35,019	35,764	36,537	Pekan Batang Serangan	1	7	20852
12.05.20	Sawit Seberang	209.10	25,197	25,765	26,331	Pekan Sawit Seberang	1	6	20811
12.05.12	Padang Tualang	221.14	46,687	52,895	55,699	Tanjung Selamat	1	11	20850
12.05.10	Hinai	105.26	47,843	52,664	54,980	Kebun Lada	1	12	20854
12.05.09	Secanggang	231.19	65,349	70,482	73,155	Hinai Kiri	1	16	20855
12.05.11	Tanjung Pura	179.61	64,412	69,018	71,499	Pekan Tanjung Pura	1	18	20853
12.05.13	Gebang	178.49	42,587	47,509	49,790	Pekan Gebang	1	10	20856
12.05.14	Babalan	76.41	56,456	56,706	57,648	Pelawi Utara	4	4	20857
12.05.17	Sei Lepan	280.68	46,810	49,630	51,257	Alor Dua	5	9	20776
12.05.18	Brandan Barat (West Brandan)	89.80	21,905	24,398	25,057	Tangkahan Durian	2	5	20881
12.05.16	Besitang	720.74	43,958	45,286	46,384	Pekan Besitang	3	6	20859
12.05.15	Pangkalan Susu	151.35	41,512	43,873	45,269	Bukit Petai	2	9	20858
12.05.23	Pematang Jaya	209.00	12,992	12,869	13,102	Limau Mungkur	-	8	20858 -20859
	Totals	6,263.29	967,535	1,030,202	1,066,711		37	240

Notes: (a) adjacent to, but not part of, Binjai city. (b) includes the offshore island of Pulau Selingkar.
(c) includes the offshore islands of Pulau Kampai, Pulau Panjang, Pulau Rawa and Pulau Sembilan.

3°46′N 98°13′E / 3.767°N 98.217°E / 3.767; 98.217