| Official Name: | West Sumba Regency |
| Native Name: | Kabupaten Sumba Barat |
| Settlement Type: | Regency |
| Pushpin Map: | Indonesia_Sumba#Indonesia_Lesser Sunda_Islands#Indonesia |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Sumba, Lesser Sunda Islands and Indonesia |
| Subdivision Type: | Country |
| Subdivision Name: |  Indonesia |
| Subdivision Type1: | Region |
| Subdivision Name1: | Lesser Sunda Islands |
| Subdivision Type2: | Province |
| Seat Type: | Capital |
| Seat: | Waikabubak |
| Leader Title: | Regent |
| Leader Name: | Agustinus Niga Dapawole |
| Leader Title1: | Vice Regent |
| Leader Name1: | Marthen Ngailu Toni |
| Unit Pref: | Imperial |
| Area Total Km2: | 737.42 |
| Population As Of: | mid 2023 estimate |
| Population Footnotes: | [1] |
| Population Total: | 152414 |
| Population Density Km2: | auto |
| Timezone: | ICST |
| Utc Offset: | +8 |
| Coordinates: | -9.5667°N 119.45°W |
| Area Code Type: | Area code |
| Area Code: | (+62) 387 |
West Sumba Regency (Indonesian: Kabupaten Sumba Barat) is a regency in East Nusa Tenggara Province of Indonesia. Established in 1958,the regency was considerably reduced on 2 January 2007 with the creation of new Regencies on Sumba Island under Law UU No.16 of that year. Its area is now 737.42 km2, and its population was 110,993 at the 2010 census[2] and 145,097 at the 2020 Census;[3] the official estimate as at mid 2023 was 152,414 (comprising 77,964 males and 74,450 females).[4] It has its seat (capital) in (Kota) Waikabubak.
The region is rather dry. One of the main problems for people living in rural areas in the province is frequent shortages of water. Although there are some local supplies of water from wells and springs, water from these sources often becomes scarce during the long dry seasons. In some villages local non-government organisations, some supported with international assistance, support small projects to improve village water supplies.[5]
The West Sumba Regency (following the re-organisation on 2 January 2007 which created Southwest Sumba Regency and Central Sumba Regency out of parts of West Sumba Regency) is now composed of six districts (kecamatan), whose areas (in km2) and populations at the 2010 Census[6] and 2020 Census,[7] are listed below, together with the official estimates as at mid 2023.[8] The table also includes the locations of the district headquarters, the number of administrative villages in each district (totaling 63 rural desa and 11 urban kelurahan), and its postal code.
| Kode Wilayah | Name of District (kecamatan) | Area in km2 | Pop'n Census 2010 | Pop'n Census 2020 | Pop'n Estimate mid 2023 | Admin centre | No. of villages | Post code |
|---|---|---|---|---|---|---|---|---|
| 53.12.12 | Lamboya | 125.65 | 15,856 | 22,059 | 23,561 | Kabukarudi | 11 | 87271 |
| 53.12.11 | Wanokata | 133.68 | 14,163 | 18,811 | 19,823 | Pogo Katoda | 14 | 87272 |
| 53.12.18 | Laboya Barat (West Laboya) | 161.23 | 7,327 | 8,815 | 9,026 | Hodi | 4 | 87270 |
| 53.12.10 | Loli | 132.36 | 27,103 | 38,932 | 41,971 | Dokakaka | 14 (a) | 87284 |
| 53.12.15 | Kota Waikabubak (Waikabubak town) | 44.71 | 28,874 | 33,064 | 33,374 | Waikabubak | 13 (b) | 87211 - 87217 |
| 53.12.04 | Tana Righu | 139.79 | 17,670 | 23,416 | 24,659 | Malata | 18 | 87257 |
| Totals | 737.42 | 110,993 | 145,097 | 152,414 | Waikabubak | 74 |
Notes: (a) comprising 5 kelurahan (Dira Tana, Loda Pare, Sobawawi, Wee Dabo and Wee Karou) and 9 desa.
(b) comprising 6 kelurahan (Kampung Baru, Kampung Sawah, Komerda, Maliti, Pada Eweta and Wailiang) and 7 desa.
Villages in the area include:
In 2016 and 2017 Travel + Leisure magazine gave the title of World's Best Hotel (with the highest 98.35 score based on readers' choice) to Nihiwatu Resort (now known as Nihi Sumba[9]). The hotel is one of the leading sectors for ecotourism.[10]
Waikabubak has a tropical monsoon climate (Am) with moderate to little rainfall from June to September and heavy to very heavy rainfall from October to May.