| Gilyuy | |
| Mouth: | Zeya |
| Mouth Coordinates: | 53.9803°N 127.46°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 545km (339miles) |
| Basin Size: | 22500km2 |
| Pushpin Map: | Russia Amur Oblast |
| Pushpin Map Caption: | Mouth location in Amur Oblast, Russia |
The Gilyuy (Russian: Гилю́й) is a river in Amur Oblast, Russia. It is a right tributary of the Zeya, and is 545 km long, with a drainage basin of 22,500 km2. The river has its sources on the southern slopes of the Stanovoy Mountains, passes near Tynda and flows southeast into the Zeya Reservoir.
Its main tributaries are the Mogot and the Tynda.