The Cibin (German: Zibin; Hungarian: Szeben) is a river in central Romania, in the south part of Transylvania. Its source is close to the highest peak in the Cindrel Mountains (known also as Cibin Mountains) of the Southern Carpathian Mountains. Upstream from its confluence with the Râul Mic, the river is also called the Râul Mare. The river flows entirely in Sibiu County.
The Cibin is an important tributary of the river Olt, flowing into it near Tălmaciu, in the immediate vicinity of the Podu Olt railway station. Its length is 82 km (51 mi) and its basin size is 2,194 km (847 sq mi).