| Official Name: | Mongeri |
| Pushpin Map: | Sierra Leone |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Sierra Leone |
| Subdivision Type: | Country |
| Subdivision Name: | Sierra Leone |
| Subdivision Type1: | Province |
| Subdivision Name1: | Southern Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Bo District |
| Unit Pref: | Imperial |
| Population As Of: | 2004 |
| Population Total: | 14,273 (est) |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Timezone: | GMT |
| Utc Offset: | -5 |
| Coordinates: | 8.3167°N -55°W |
Mongeri is a town in Bo District in the Southern Province of Sierra Leone. Its population was estimated at 14,273 (2004 census). The population of Mongeri is mostly from the Mende ethnic group. It is the birthplace of Samuel Hinga Norman, the founder and leader of the traditional Civil Defence Forces (commonly known as the Kamajors).