Kosatka Island (Bulgarian: остров Косатка, romanized: ostrov Kosatka, IPA: [ˈɔstrof koˈsatkɐ]) is the mostly ice-covered island 653 m long in west–east direction and 195 m wide in the Dannebrog Islands group of Wilhelm Archipelago in the Antarctic Peninsula region.

Its surface area is 8.86 ha.

[1] The feature is so named because of its shape supposedly resembling a killer whale ('kosatka' in Bulgarian), and in association with other descriptive names of islands in the area.

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

This Wilhelm Archipelago location article is a stub.