Callophrys dumetorum, the coastal green hairstreak, bramble green hairstreak, or bluish green hairstreak, is a butterfly of the family Lycaenidae. It is found in the United States in coastal California and rarely in inland California. Subspecies C. d. oregonensis is known as the Oregon green hairstreak.

Callophrys dumetorum
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Lycaenidae
Genus:	Callophrys
Species:	C. dumetorum
Binomial name
Callophrys dumetorum (Boisduval, 1852)
Synonyms
Thecla dumetorum Boisduval, 1852 Thecla viridis Edwards, 1862 Callophrys viridis (Edwards, 1862) Callophrys perplexa oregonensis

The wingspan is 25–32 mm. Adults are on wing from March to May in one generation.

Larvae have been recorded on Lotus scoparius, Eriogonum fasciculatum, Eriogonum latifolium, and Eriogonum nudum. Adults feed on flower nectar from host plants. They also feed on buckwheats and desert parsley. Its habitats include open sites and clearings in Douglas-fir and ponderosa pine forests, road-cuts, and coastal dunes.^[1]