The Bali–Sasak–Sumbawa languages are a group of closely related languages spoken in Indonesia in the western Lesser Sunda Islands (Bali and West Nusa Tenggara).

The three languages are Balinese on Bali, Sasak on Lombok, and Sumbawa on western Sumbawa.

These languages have similarities with Javanese, which several classifications have taken as evidence of a relationship between them.

However, the similarities are with the "high" registers (formal language/royal speech) of Balinese and Sasak; when the "low" registers (commoner speech) are considered, the connection appears instead to be with Madurese and Malay.

Adelaar (2005) assigned them to a larger "Malayo-Sumbawan" subgroup, [2] but this proposal remains controversial.