| Official Name: | Tmassa |
| Settlement Type: | Town |
| Pushpin Map: | Libya |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Libya |
| Subdivision Type: | Country |
| Subdivision Name: |  Libya |
| Subdivision Type1: | Region |
| Subdivision Name1: | Fezzan |
| Subdivision Type2: | District |
| Subdivision Name2: | Murzuq |
| Unit Pref: | Imperial |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Timezone: | EET |
| Utc Offset: | +2 |
| Coordinates: | 26.3667°N 63°W |
Tmassa is a small town in the Sahara Desert of central Libya about from the Gulf of Sidra. It lies about south-east of Sabha. Its population is 500.[1]