West Sumbawa Regency (Indonesian: Kabupaten Sumbawa Barat) is a Regency (Kabupaten) of the Indonesian Province of West Nusa Tenggara.

Poto Tano, the most important harbour of West Sumbawa, is easily accessible by ferry from Lombok.

West Sumbawa Regency originally comprised five districts (kecamatan) formerly part of Sumbawa Regency, but now consists of eight districts, 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 57 rural desa and 7 urban kelurahan - the latter all in Taliwang District), and its postal codes.

(c) comprises 7 urban kelurahan (Arab Kenangan, Bugis, Dalam, Kuang, Menala, Sampir and Telaga Bertong) and 8 desa.