Lembata Regency is a regency in East Nusa Tenggara province of Indonesia. Established on 4 October 1999 (under administrative Law UU 52/1999) from the most easterly part of East Flores Regency, the regency covers the island of Lembata (formerly known as Lomblen), together with three small offshore islands together forming the eastern part of the Solor Archipelago, and has its administrative seat (capital) in Lewoleba. The population of the Regency was 117,829 at the 2010 decennial census and at the 2020 census was 135,930; the official estimate as at mid 2023 was 137,812.

The regency is divided into nine districts (kecamatan), tabulated 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 location of the district headquarters, the number of administrative villages in each district (totaling 144 rural desa and 7 urban kelurahan - the latter all in Nubatukan District), and its post code.

Kode Wilayah	Name of District (kecamatan)	Location	Area in km	Pop'n census 2010	Pop'n census 2020	Pop'n estimate mid 2023	Admin centre	No. of villages	Post codes
53.13.01	Nagawutung	(Southwest Lembata)	185.41	8,735	10,120	10,196	Loang	18	86684
53.13.02	Atadei	(Southeast Lembata)	142.99	7,537	7,700	7,739	Kalikasa	15	86685
53.13.03	Ile Ape	(Northwest Lembata)	91.86	11,499	13,150	13,769	Waipukang	17	86683
53.13.04	Lebatukan	(Central Lembata)	272.08	8,550	9,770	10,208	Hadakewa	17	86681
53.13.05	Nubatukan	(West Lembata)	181.78	33,236	40,200	36,772	Lewoleba	18
53.13.06	Omesuri	(East Lembata)	184.80	15,919	18,830	21,502	Balauring	22	86691
53.13.07	Buyasuri	(Far East Lembata)	121.49	18,879	21,270	23,003	Wairiang	20	86692
53.13.08	Wulandoni	(South Lembata)	125.87	8,375	9,020	9,139	Wulandoni	15	86686
53.13.09	Ile Ape Timur	(East Ile Ape)	48.98	5,099	5,880	5,484	Lamaau	9	86687
	Total island		1,355.26	117,829	135,930	137,812	Lewoleba	151

Notes: (a) includes offshore island of Pulau Sewanggi. (b) includes offshore islands of Batutara and Watonubi. (c) includes regency capital of Lewoleba town.
(d) of the seven kelurahan, Lewoleba has a postcode of 86611, Lewoleba Utara of 86612, Lewoleba Barat of 86613, Lewoleba Tengah of 86615, Lewoleba Timur (and the desa of Lite Ulu Mado) of 86616, while Lewoleba Selatan and Selandoro, together with the remaining ten desa, share the postcode of 86682.

Nagawutung District comprises the 18 desa of Atawai, Babokerong, Baobolak, Belabaja, Boli Bean, Duawutun, Idalolong, Ile Boli, Labalimut, Liwulagang, Lolong, Lusiduawutun, Pasir Putih, Penikene, Ria Bao, Tewaowutung, Warawatung and Wuakerong.
Atadei District comprises the 15 desa of Atakore, Dori Pewut, Dulir, Ile Kerbau, Ile Kimok, Katakeja, Nubaboli, Lebaata, Lerek, Lusilame, Nogo Doni, Nuba Atalojo, Nubahaeraka, Tubuk Rajan and Lewogroma.
Ile Ape District comprises the 17 desa of Amakaka, Beutaran, Bungamuda, Dulitukan, Kolipadan, Kolontobo, Lamawara, Laranwuntun, Muruona, Napasabok, Petuntawa, Plilolon, Riangbao, Tagawiti, Tanjung Batu, Waowala and Watodiri.
Lebatukan District comprises the 17 desa of Atakowa, Baopana, Balurebong, Banitobo, Dikesare, Hadakewa, Lamadale, Lamalela, Lamatuka, Lerahinga, Lewoeleng, Lodotodokowa, Merdeka, Seranggorang, Tapobaran, Tapolangu and Waienga.
Nubatukan District comprises the 7 kelurahan of Lewoleba, Lewoleba Barat, Lewoleba Selatan, Lewoleba Tengah, Lewoleba Timur, Lewoleba Utara and Selandoro, plus the 11 desa of Bakalerek, Baolangu, Belobatang, Bour, Lite Ulumado, Nuba Mado, Pada, Paubokol, Udak Melomata, Waijarang and Watokobu.
Omesuri District comprises the 22 desa of Aramengi, Balauring, Dolulolong, Hingalamamengi, Hoelea, Hoelea II, Lebewala, Leubatang, Leudanung, Leuwayang, Mahal, Mahal II, Meluwiting, Meluwiting I, Nilanapo, Normal, Normal I, Peusawah, Roma, Wailolong, Walangsawah and Wowong.
Buyasuri District comprises the 20 desa of Atu Wa'lupang, Atulaleng, Bareng, Bean, Benihading I, Benihading II, Buriwutung, Kalikur, Kalikur WL, Kaohua, Leuburi, Leuwohung, Loyobohor, Mampir, Panama, Roho, Rumang, Tobotani, Tubung Walang and Umaleu.
Wulandoni District comprises the 15 desa of Alap Atadei, Atakera, Ataili, Belobao, Imulolong, Lamalera A, Lamalera B, Lelata, Leworaja, Pantai Harapan, Puor, Puor B, Posiwatu, Tapobali and Wulandoni.
Ile Ape Timur District comprises the 9 desa of Aulesa, Bao Lai Duli, Jontona, Lamaau, Lamagute, Lamatokan, Lamawolo, Todanara and Waimatan.

Mount Ile Lewotolok, an active volcano, is located in the north central part of Lembata Island. In November 2020, it erupted, leading to the evacuation of over 4,000 people from areas close to the volcano.

• Official website