| Mornoi River | |
| Pushpin Map: | India Assam#India |
| Subdivision Type1: | State |
| Subdivision Name1: | Assam |
| Source1: | Matia village |
| Source1 Location: | Goalpara district, Assam |
| Source1 Coordinates: | 26.0784°N 90.7564°W |
| Mouth: | Brahmaputra River |
| Mouth Coordinates: | 26.1143°N 90.7466°W |
| Progression: | Krishnai River - Dudhnoi River – Mornoi River - Brahmaputra River |
The Mornoi River is a tributary of the Brahmaputra River in the Indian state of Assam. The Mornoi river originates at Matia village of Goalpara district. The Krishnai River meets Dudhnoi River at Matia village and then flows as Mornoi river before its confluence with the Brahmaputra River.[1]