| Ouaninou Department | |
| Native Name: | Département d'Ouaninou |
| Native Name Lang: | fr |
| Settlement Type: | Department |
| Subdivision Type: | Country |
| Subdivision Type1: | District |
| Subdivision Name1: | Woroba |
| Subdivision Type2: | Region |
| Subdivision Name2: | Bafing |
| Seat Type: | Departmental seat |
| Seat: | Ouaninou |
| Established Title: | 2011 |
| Established Date: | Established via a division of Touba Dept |
| Government Footnotes: | [1] |
| Leader Title: | Prefect |
| Leader Name: | Ballet Albert Zaouella |
| Unit Pref: | Metric |
| Area Total Km2: | 2260 |
| Population Total: | 65981 |
| Population Footnotes: | [2] |
| Population As Of: | 2021 |
| Population Density Km2: | auto |
| Timezone: | GMT |
| Utc Offset: | +0 |
Ouaninou Department is a department of Bafing Region in Woroba District, Ivory Coast. In 2021, its population was 65,981 and its seat is the settlement of Ouaninou. The sub-prefectures of the department are Gbelo, Gouékan, Koonan, Ouaninou, Saboudougou, and Santa.
Ouaninou Department was created in 2011 as part of the restructuring of the subdivisions of Ivory Coast, when departments were converted from the second-level administrative subdivisions of the country to the third-level subdivisions. It was created by splitting Touba Department.