Jalmenus eichhorni, the northern hairstreak or northern imperial blue, is a butterfly of the family Lycaenidae.

It is endemic to Queensland, Australia, including Cape York.

The larvae feed on a various Acacia species, including A. crassicarpa, A. leptocarpa, A. humifusa and A. holosericea.

The caterpillars are attended by the ant species Iridomyrmex gracilis, Iridomyrmex reburrus and Iridomyrmex sanguineus.

This Theclinae-related article is a stub.