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Supii
The Supii near Yahotyn
Location
Country	Ukraine
Physical characteristics
Source
• location	Chernihiv Oblast, Ukraine
Mouth	Dnieper
• coordinates	49°37′26″N 31°48′01″E / 49.6238°N 31.8003°E / 49.6238; 31.8003
Length	130 km (81 mi)
Basin size	2,000 km2 (770 sq mi)
Basin features
Progression	Dnieper→ Dnieper–Bug estuary→ Black Sea

The Supii (Ukrainian: Супій) is a river in Ukraine, 130 km in length, a left tributary of the Dnieper. The Supii finds its source in Nizhyn Raion, Chernihiv Oblast.