Callophrys affinis, the western green hairstreak or immaculate green hairstreak, is a butterfly of the family Lycaenidae.

It is found in western Canada and the western United States.

[1] Adults are on the wing from early March to mid-June in one generation.

[1] The larvae feed on Eriogonum umbellatum.

This Eumaeini-related article is a stub.