| Official Name: | Ouanho |
| Settlement Type: | Arrondissement |
| Pushpin Map Caption: | Location in Benin |
| Subdivision Type: | Country |
| Subdivision Name: |  Benin |
| Subdivision Type1: | Department |
| Subdivision Name1: | Ouémé Department |
| Subdivision Type2: | Commune |
| Subdivision Name2: | Avrankou |
| Unit Pref: | Imperial |
| Population As Of: | 2002 |
| Population Total: | 8712 |
| Timezone: | WAT |
| Utc Offset: | +1 |
Ouanho is an arrondissement in the Ouémé department of Benin. It is an administrative division under the jurisdiction of the commune of Avrankou. According to the population census conducted by the Institut National de la Statistique Benin on February 15, 2002, the arrondissement had a total population of 8712.[1]