| Ribnik Island | |
| Map: | Antarctic Peninsula |
| Location: | Antarctica |
| Coordinates: | -65.3681°N -65.3594°W |
| Archipelago: | Biscoe Islands |
| Population: | 0 |
| Country: | None |
| Treaty System: | Antarctic Treaty System |
Ribnik Island (bg|остров Рибник|ostrov Ribnik, pronounced as /bg/) is a mostly ice-covered island in the Pitt group of Biscoe Islands, Antarctica. The feature is 1 km long in southwest-northeast direction and 500 m wide.
The island is named after the settlement of Ribnik in Southwestern Bulgaria.
Ribnik Island is located at -65.3681°N -65.3594°W, 780 m south-southeast of Knezha Island, 3.35 km northwest of Trundle Island and 3.4 km north of Vaugondy Island. British mapping in 1971.