West Nusa Tenggara (Indonesian: Nusa Tenggara Barat) is a province in south-central Indonesia. It covers the western portion of the Lesser Sunda Islands, except for Bali.

The two largest islands in the province are Lombok in the west and the larger Sumbawa island in the east. Mataram, on Lombok, is the capital and largest city of the province.

Lombok is mainly inhabited by the the Sasak ethnic group, with a minority Balinese population, and Sumbawa is inhabited by Sumbawa and Bima ethnic groups. Each of these groups has a local language associated with it as well.

A 2002 United Nations Development Programme report classified West Nusa Tenggara as the least-developed province in Indonesia.