Satyrium saepium, the hedgerow hairstreak, is a butterfly of the family Lycaenidae. It is found in western North America, from British Columbia south through California into Baja California and east through northern Arizona to northern New Mexico, Colorado and Montana.

The wingspan is 26–30 mm. Adults are on wing from April to September. They feed on the nectar of various flowers, including yerba santa and wild buckwheats.

The larvae feed on the buckbrush (Ceanothus species, Rhamnaceae).

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