| Official Name: | Tercer Frente |
| Settlement Type: | Municipality |
| Subdivision Type: | Country |
| Subdivision Name: | Cuba |
| Subdivision Type1: | Province |
| Subdivision Name1: | Santiago de Cuba |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Cruce de los Baños |
| Area Total Km2: | 364.3 |
| Population As Of: | 2022 |
| Population Total: | 30,237 |
| Population Density Km2: | auto |
| Timezone: | EST |
| Utc Offset: | -5 |
| Coordinates: | 20.1719°N -76.3275°W |
| Elevation M: | 225 |
| Area Code: | +53-226 |
| Website: | https://www.tercerfrente.gob.cu/ |
Tercer Frente (pronounced as /es/, Spanish for "Third Front") is a municipality in the Santiago de Cuba Province of Cuba. It is centered on the town, and municipal seat, of Cruce de los Baños.
The municipality is located in the western part of the province, neighboring the province of Granma, and borders with the municipalities of Guisa, Jiguaní, Contramaestre, Palma Soriano and Guamá.
It includes the town of Cruce de los Baños and the villages of El Yayal, Manaca and Matias.
In 2022, the municipality of Tercer Frente had a population of 30,237.[1] With a total area of 364km2, it has a population density of 83/km2.