West Nusa Tenggara (Indonesian: Nusa Tenggara Barat often abbreviated to NTB) is a province in south-central Indonesia. The province encompasses the western portion of the Lesser Sunda Islands, except for Bali as the Wallace line running the length of the Lombok Strait forms the western boundary of the province.

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, while Bima is the largest city on Sumbawa.

A 2002 United Nations Development Programme report classified West Nusa Tenggara as the least-developed province in Indonesia.^{[citation needed]}