| Billio | |
| Native Name: | Bilioù |
| Commune Status: | Commune |
| Coordinates: | 47.8692°N -2.6317°W |
| Insee: | 56019 |
| Postal Code: | 56420 |
| Arrondissement: | Pontivy |
| Canton: | Moréac |
| Mayor: | Jean-Luc Grandin[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Centre Morbihan Communauté |
| Elevation Min M: | 81 |
| Elevation Max M: | 167 |
| Area Km2: | 12.03 |
Billio (in French pronounced as /biljo/; Breton: Bilioù) is a commune in the Morbihan department of Brittany in northwestern France.
Inhabitants of Billio are called Billiotais in French.