| Le Guerno | |
| Native Name: | Ar Gwernoù |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Le Guerno (Morbihan).svg |
| Coordinates: | 47.5839°N -2.4069°W |
| Insee: | 56077 |
| Postal Code: | 56190 |
| Arrondissement: | Vannes |
| Canton: | Muzillac |
| Mayor: | Gérard Guillotin[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Arc Sud Bretagne |
| Elevation Min M: | 45 |
| Elevation Max M: | 86 |
| Area Km2: | 9.75 |
Le Guerno (in French pronounced as /lə ɡɛʁno/ or in French pronounced as /lə ɡɥɛʁno/;) is a commune in the Morbihan department of Brittany in north-western France.[2] Inhabitants of Le Guerno are called Guernotais.