| Lantillac | |
| Native Name: | Landeliav |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Lantillac (Morbihan).svg |
| Coordinates: | 47.9575°N -2.6506°W |
| Insee: | 56103 |
| Postal Code: | 56120 |
| Arrondissement: | Pontivy |
| Canton: | Ploërmel |
| Mayor: | Michel Bertho[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Ploërmel Communauté |
| Elevation Min M: | 41 |
| Elevation Max M: | 124 |
| Area Km2: | 7.72 |
Lantillac (in French pronounced as /lɑ̃tijak/; Breton: Lantilieg) is a commune in the Morbihan department of Brittany in north-western France.[2] Inhabitants of Lantillac are called in French Lantillacois.