| Nassian Department | |
| Native Name: | Département de Nassian |
| Native Name Lang: | fr |
| Settlement Type: | Department |
| Subdivision Type: | Country |
| Subdivision Type1: | District |
| Subdivision Name1: | Zanzan |
| Subdivision Type2: | Region |
| Subdivision Name2: | Bounkani |
| Seat Type: | Departmental seat |
| Seat: | Nassian |
| Established Title: | 2005 |
| Established Date: | Established as a second-level subdivision via a division of Bouna Dept |
| Established Title1: | 2011 |
| Established Date1: | Converted to a third-level subdivision |
| Government Footnotes: | [1] |
| Leader Title: | Prefect |
| Leader Name: | Koné Sounan Jacques |
| Unit Pref: | Metric |
| Area Total Km2: | 2810 |
| Population Total: | 71724 |
| Population Footnotes: | [2] |
| Population As Of: | 2021 census |
| Population Density Km2: | auto |
| Timezone: | GMT |
| Utc Offset: | +0 |
Nassian Department is a department of Bounkani Region in Zanzan District, Ivory Coast. In 2021, its population was 71,724 and its seat is the settlement of Nassian. The sub-prefectures of the department are Bogofa, Kakpin, Koutouba, Nassian, and Sominassé.
Nassian Department was created in 2005 as a second-level subdivision via a split-off from Bouna Department.[3] [4] At its creation, it was part of Zanzan Region.
In 2011, districts were introduced as new first-level subdivisions of Ivory Coast. At the same time, regions were reorganised and became second-level subdivisions, and all departments were converted into third-level subdivisions. At this time, Nassian Department became part of Bounkani Region in Zanzan District.
In 2014, the population of the sub-prefecture of Nassian was 19,971.[5]
The seventeen villages of the sub-prefecture of Nassian and their population in 2014 are:[5]