| Krishnai River | |
| Pushpin Map: | India Assam#India |
| Subdivision Type1: | State |
| Subdivision Name1: | Meghalaya & Assam |
| Source1: | West Garo Hills |
| Source1 Location: | Meghalaya |
| Source1 Coordinates: | 25.6209°N 90.362°W |
| Mouth: | Mornoi River |
| Mouth Coordinates: | 26.075°N 90.7547°W |
| Progression: | Krishnai River - Dudhnoi River – Mornoi River - Brahmaputra River |
The Krishnai River is a sub-tributary of the Brahmaputra River in the Indian state of Assam. The Krishnai River originates in the West Garo Hills of Meghalaya. The Krishnai River meets Dudhnoi River at Matia of Goalpara district and then flows as Mornoi River before its confluence with the Brahmaputra River.[1]