Lycaena clarki, the eastern sorrel copper, is a butterfly of the family Lycaenidae.

The butterfly flies year-round, peaking in summer.

[3] Larval food is Rumex lanceolatus.

[3] The larvae vary considerably in colour, ranging from plain green to pinkish red.

However, there is always a white subspiracular stripe and a dorsal line of a darker colour.