Vilkitsky Island (Russian: Остров Вильки́цкого, romanized: Ostrov Vilkitskogo; Yakut: Вилькицкай Aрыыта, romanized: Vil'kitskay Arııta) is the southernmost island of the De Long group in the northern part of the East Siberian Sea.

[3] Judging from bedrock outcrops associated with the central, steepest part of seacliffs on its southern coast, Vilkitsky Island is composed of limburgite, a dense dark gray volcanic rock.

This volcanic rock occurs as both massive intrusions and lava flows, both of which exhibit narrow shear zones.

[5][6][7] Vilkitsky Island was discovered early on the morning of August 20, 1913 by the crew of the Icebreaker Taymyr.

On August 24, 1914, a landing party from the Icebreaker Taymyr revisited Vilkitskiy Island and surveyed it.