| Ruza | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 145km (90miles) |
| Mouth: | Moskva |
| Mouth Coordinates: | 55.6283°N 36.2813°W |
| Basin Size: | 1990km2 |
The Ruza (Russian: Руза) is a river in Moscow Oblast, Russia. It is a left tributary of the Moskva.[1] The length of the river is . The area of its basin is .[2] It usually freezes over in November and stays under the ice until April.