Aceh Tamiang Regency (Indonesian: Kabupaten Aceh Tamiang) is a regency in the east of Aceh province of Indonesia, bordering on North Sumatra Province to the east.

It is located on the island of Sumatra, and was formed on 10 April 2002 from what were previously the southeastern districts of East Aceh Regency.

[1] The seat of the regency government is at the town of Karang Baru.

The regency is divided administratively into twelve districts (kecamatan), listed 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 location of the district administrative centres, the number of villages (gampong) in each district, and its postal code.