The three arrondissements of the Morbihan department are:[1]
- Arrondissement of Lorient, (subprefecture: Lorient) with 58 communes. The population of the arrondissement was 312,063 in 2016.
- Arrondissement of Pontivy, (subprefecture: Pontivy) with 93 communes.[2] The population of the arrondissement was 155,521 in 2016.
- Arrondissement of Vannes, (prefecture of the Morbihan department: Vannes) with 99 communes. The population of the arrondissement was 279,964 in 2016.