The Halfmoon Cove (Polish: Zatoka Półksiężyca) is a cove in Admiralty Bay, on the coast of King George Island, in the archipelago of the South Shetland Islands.

It stretches from Shag Point to Rakusa Point.

Alongside the cove is located the Jasnorzewski Gardens meadow, near which is placed the Henryk Arctowski Polish Antarctic Station.

[1][2][3] It was named Halfmoon Cove (Polish: Zatoka Półksiężyca), after the semicircle shape of its coast, similar to the first and last quarter lunar phase.

The name was introduced in 1977, by Wayne Z. Trivelpiece and Nicholas J. Volkman, ornithologists who resided in the Arctowski station between 1977 and 1978.