| Gręziniec | |
| Mouth Location: | Oder |
| Mouth Coordinates: | 53.4589°N 14.5944°W |
| Subdivision Type1: | Country |
| Tributaries Right: | Sienniczka |
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.