Giganteus Island is the most northern of the Rookery Islands in the west part of Holme Bay, MacRobertson Land.

Mapped by Norwegian cartographers from air photos taken by the Lars Christensen Expedition, 1936–37.

A giant petrel (Macronectes giganteus) rookery was observed by ANARE on the island in December 1958, hence the name.

Robertson Land location article is a stub.

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