| Lieser | |
| Map: | Lieser.png |
| Map Size: | 280px |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Rhineland-Palatinate |
| Subdivision Type3: | Districts |
| Subdivision Name3: | Vulkaneifel and Bernkastel-Wittlich |
| Subdivision Type4: | Reference no. |
| Subdivision Name4: | DE: 2678 |
| Length: | 73.6 km |
| Source1 Location: | In the High Eifel near Boxberg |
| Source1 Elevation: | ca. |
| Mouth Location: | Near Lieser into the Moselle |
| Mouth Elevation: | ca. [1] |
| Basin Landmarks: | Small towns: Daun, Wittlich |
| Basin Size: | 402.4 km² |
| Discharge1 Location: | at Plein gauge[2] |
| Discharge1 Min: | Record low: 18 L/s (in 19.08.1998) Average low: 184 L/s |
| Discharge1 Avg: | 3.49 m3/s |
| Discharge1 Max: | Average high: 64.2 m3/s Record high: 124 m3/s (in 12.01.1993) |
| Tributaries Right: | Kleine Kyll (this and other below) |
| Tributaries Left: | Sterenbach (this and other below) |
| Custom Label: | References |
The Lieser (pronounced as /de/) is a small river in Rhineland-Palatinate, Germany, a left tributary of the Moselle. It rises in the Eifel, near Boxberg, north of Daun. The Lieser flows south through Daun, Manderscheid and Wittlich. It flows into the Moselle west of the village of Lieser.