Ribnik Island (Bulgarian: остров Рибник, romanized: ostrov Ribnik, IPA: [ˈɔstrof ˈribnik]) 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.

This article includes information from the Antarctic Place-names Commission of Bulgaria which is used with permission.

This Biscoe Islands location article is a stub.