| Mongo Island | |
| Pushpin Map: | Tanzania |
| Pushpin Relief: | Yes |
| Map Width: | 200 |
| Location: | Sea of Zanj |
| Length Km: | 4.0 |
| Width Km: | 1.8 |
| Ethnic Groups: | Makonde |
| Languages: | Swahili |
| Country Admin Divisions Title: | Region |
| Country Admin Divisions: | Mtwara Region |
| Country Admin Divisions Title 1: | District |
| Country Admin Divisions 1: | Mtwara District |
| Country Admin Divisions Title 2: | Ward |
| Country Admin Divisions 2: | Msanga Mkuu |
Mongo Island (Kisiwa cha Mongo, in Swahili) is an island located in Msanga Mkuu ward of Mtwara District in Mtwara Region, Tanzania. Situated within the Mnazi Bay-Ruvuma Estuary Marine Park, the island is likewise uninhabited. It is the largest island in Mtwara territory and is located in Mnazi Bay.[1] [2]