The department Morbihan has 23 cantons.
| Code ▲ | Name | Central office | Com. |
|---|---|---|---|
| 5601 | Auray | Auray | 7 |
| 5602 | Gourin | Gourin | 29 |
| 5603 | Grand-Champ | Grand-Champ | 17 |
| 5604 | Guer | Guer | 23 |
| 5605 | Guidel | Guidel | 11 |
| 5606 | Hennebont | Hennebont | 6 |
| 5607 | Lanester | Lanester | 2 |
| 5608 | Lorient-1 | Lorient | 1 |
| 5609 | Lorient-2 | Lorient | 2 |
| 5610 | Moréac | Moréac | 23 |
| 5611 | Muzillac | Muzillac | 15 |
| 5612 | Ploemeur | Ploemeur | 3 |
| 5613 | Ploërmel | Ploërmel | 29 |
| 5614 | Pluvigner | Pluvigner | 11 |
| 5615 | Pontivy | Pontivy | 14 |
| 5616 | Questembert | Questembert | 16 |
| 5617 | Quiberon | Quiberon | 16 |
| 5618 | Séné | Séné | 10 |
| 5619 | Vannes-1 | Vannes | 1 |
| 5620 | Vannes-2 | Vannes | 10 |
| 5621 | Vannes-3 | Vannes | 6 |
| 5698 | Lorient | Lorient | 1 |
| 5699 | Vannes | Vannes | 1 |