The insect, which is believed to have spent the winter hibernating in the Island, was discovered alive in a house at Anne Port on Monday.
Asian hornets, which are darker in appearance than their European counterparts, pose a serious threat to the Island's bee population and have been known to destroy their colonies elsewhere.
John Pinel, principal ecologist at the Environment Department, said that the insect was likely to have arrived in the Island last year after flying over from France.
Sightings of the hornets can be reported to the department on 441600. They can also be recorded through a free UK government app, called Asian Hornet Watch, which forwards information to the Jersey authorities.
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