| Southwest Tanna | |
| Also Known As: | Nawal |
| States: | Vanuatu |
| Region: | Tanna Island |
| Speakers: | 4,500 |
| Date: | 2011 |
| Ref: | e18 |
| Familycolor: | Austronesian |
| Fam2: | Malayo-Polynesian |
| Fam3: | Oceanic |
| Fam4: | Southern Oceanic |
| Fam5: | South Vanuatu |
| Fam6: | Tanna |
| Iso3: | nwi |
| Glotto: | sout2869 |
| Glottorefname: | Southwest Tanna |
| Map: | Lang Status 99-NE.svg |
Southwest Tanna is a dialect chain spoken on the southwestern coast of Tanna Island in Vanuatu. Lynch (1982) names three major dialects: Nivhaal in the north-west of the language area (spelt "Nauvhal" in publicity for the 2015 film Tanna), Nivai in the south-west, and Nelpwaai in the north-east.[1]