Lepidochrysops tantalus, the king blue, is a butterfly of the family Lycaenidae found in South Africa.

It is local to the Drakensberg foothills in the Eastern Cape to the KwaZulu-Natal midlands, Eswatini, then along the escarpment hills to Mpumalanga and Gauteng.

Adults are on wing from September to November.

[2] Despite sharing a common habitat with L. lotana, it can be differentiated by being darker and smaller.

It also shows an erratic and unstable flight pattern compared to L.lotana.