| Mersing River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Malaysia |
| Mouth Location: | South China Sea near Mersing, Mersing District |
| Mouth Coordinates: | 2.4358°N 103.8403°W |
| Mouth Elevation: | 0m (00feet) |
| Basin Size: | 270km2 |
The Mersing River (Malay: Sungai Mersing) is a river in the state of Johor, Malaysia. It flows from south to north with a catchment of 270 km².[1] The river's mouth is in Mersing and it empties into the South China Sea.