East Aceh Regency (Indonesian: Kabupaten Aceh Timur) is a regency in eastern Aceh province of Indonesia. It is located on the island of Sumatra. The regency covers an area of 6,040.6 square kilometres and had a population of 360,475 at the 2010 Census and 422,401 at the 2020 Census; the official estimate as at mid 2023 was 449,796 - comprising 226,316 males and 223,430 females. The regency capital is the town of Idi Rayeuk.

The regency borders the Malacca Strait to the north-east, the city of Langsa and Aceh Tamiang Regency to the south-east, Gayo Lues Regency to the south, and Central Aceh Regency, Bener Meriah Regency and North Aceh Regency to the west.

This regency is rich in petroleum, more so than the North Aceh and Aceh Tamiang regencies. Fishing employs many people in the regency but little of it is exported; people depend on it for food. The main fishing centre in the regency is in Idl. The regency also has several food-plant based industries producing tofu, tempeh and sun-dried banana chips. Some areas are under plantation exploitation for palm oil and rubber, although there is only one state-owned company (TPN I) operating in the area. Plantations also produce cacao and chocolate and in the Lokop area iron ore and lead is mined.

The regency is divided administratively into twenty-four districts (kecamatan), listed below with their areas and their populations at the 2010 Census and 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 postal 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
11.03.05	Serbajadi	2,165.66	5,766	6,701	7,603	Lokop	17	24460
11.03.20	Simpang Jernih	544.63	3,397	3,626	3,784	Simpang Jernih	8	24464
11.03.24	Peunaron	79.74	8,206	9,154	9,507	Arul Pinang	5	24461
11.03.04	Birem Bayeun	253.68	25,330	28,710	29,538	Birem Bayeun	27	24452
11.03.08	Rantau Selamat	159.80	11,223	12,372	13,375	Bayeun	14	24451
11.03.19	Sungai Raya	159.00	10,672	12,672	13,501	Labuhan Keude	13	24466
11.03.07	Peureulak	318.02	39,691	46,245	49,202	Peureulak	38	24453
11.03.17	Peureulak Timur (East Peureulak)	182.70	12,601	14,457	15,366	Alue Tho	20	24440
11.03.18	Peureulak Barat (West Peureulak)	92.30	13,633	17,367	18,566	Beusa Seubrang	15	24450
11.03.10	Ranto Peureulak	129.00	21,945	25,945	27,931	Ranto Peureulak	23	24441
11.03.03	Idi Rayeuk	79.60	33,136	39,086	41,323	Idi Rayeuk	35	24442
11.03.16	Peudawa	75.90	10,274	12,958	13,759	Seuneubok Peudawa	17	24469
11.03.15	Banda Alam	90.95	7,296	8,651	9,429	Pantai Rayeuk M.	16	24458
11.03.14	Idi Tunong	74.70	8,895	11,305	12,486	Buket Teukuh	25	24443
11.03.21	Darul Ihsan	54.50	5,447	7,343	8,003	Keude Dua	16	24468
11.03.23	Idi Timur (East Idi)	55.15	5,210	6,762	7,609	Keude Redep	13	24456
11.03.01	Darul Aman	131.50	17,043	20,569	22,727	Idi Cut	45	24455
11.03.06	Nurussalam	137.07	15,308	17,843	18,865	Bagok	31	24467
11.03.22	Darul Falah	42.40	2,902	3,752	4,020	Tunung Ulee Gajah	11	24454
11.03.02	Julok	234.36	23,884	26,835	28,147	Kuta Binjei	37	24459
11.03.13	Indra Makmur	89.05	15,772	16,416	16,727	Alue le Mirah	13	24457
11.03.11	Pante Bidari (or Pante Beudari)	233.25	21,490	25,588	27,286	Lhok Nibong	25	24463
11.03.09	Simpang Ulim	123.80	18,136	21,136	22,223	Simpang Ulim	23	24465
11.03.12	Madat	200.84	23,218	26,908	28,819	Madat	26	24462
	Totals	6,040.60	360,475	422,401	449,796	Idi Rayeuk	513

4°37′N 97°37′E / 4.617°N 97.617°E / 4.617; 97.617