| River Glass | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Isle of Man |
| Subdivision Type5: | City |
| Subdivision Name5: | Douglas |
| Length Km: | 11.5 |
| Source1: | Injebreck Hill |
| Source1 Coordinates: | 54.239°N -4.515°W |
| Source1 Elevation: | 270m (890feet) |
| Mouth: | Confluence with River Dhoo |
| Mouth Coordinates: | 54.151°N -4.502°W |
| Tributaries Left: | Injebreck River, Colder River |
| Tributaries Right: | Baldwin River, Sulby River |
The River Glass is a river on the Isle of Man. The river begins in the area of Injebreck about 10 km north of Douglas, the Island's capital. Flowing down through the West Baldwin Valley, the river joins the River Dhoo to form the River Douglas on the outskirts of Douglas before flowing out to sea. The river has a length of approximately 8.5 km.
The name Glass originates from the word for green in Manx.
The western edge of the parish of Onchan is formed by the path of the Glass.