Gręziniec (also Grzęziniec) is a 5.5-km river of northwestern Poland, with its headwaters in the Ueckermünde Heath. It flows through the city of Szczecin and joins the Oder from the left bank.

Gręziniec
Map
Location
CountryPoland
Physical characteristics
Mouth 
 • location
Oder
 • coordinates
53°27′32″N 14°35′40″E / 53.4589°N 14.5944°E / 53.4589; 14.5944
Basin features
ProgressionOderBaltic Sea
Tributaries 
 • rightSienniczka