Mamer
Location
Country	Luxembourg
Physical characteristics
Source
• location	Hivange
Mouth	Alzette
• location	Mersch
• coordinates	49°44′51″N 6°06′23″E / 49.74750°N 6.10639°E / 49.74750; 6.10639
Length	25 km (16 mi)
Basin features
Progression	Alzette→ Sauer→ Moselle→ Rhine→ North Sea

The Mamer is a river flowing through Luxembourg, joining the Alzette at Mersch. It flows through the towns of Mamer and Kopstal. The river is an indirect tributary to the river Moselle.^{[citation needed]}