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 km² and its population was 967,535 at the 2010 Census^[2] and 1,030,202 at the 2020 Census;^[3] the official estimate as at mid 2023 was 1,066,711 - comprising 538,822 males and 527,889 females.^[1]

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^[2] and the 2020 Census,^[3] together with the official estimates as at mid 2023.^[1] 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.

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.