The three arrondissements of the Morbihan department are:[1]
- Arrondissement of Lorient, (subprefecture: Lorient) with 58 communes. The population of the arrondissement was 320,544 in 2021.
- Arrondissement of Pontivy, (subprefecture: Pontivy) with 92 communes. The population of the arrondissement was 156,187 in 2021.
- Arrondissement of Vannes, (prefecture of the Morbihan department: Vannes) with 99 communes. The population of the arrondissement was 291,956 in 2021.