''Satyrium favonius'', the oak hairstreak or southern hairstreak, is a butterfly of the family Lycaenidae. It is found in the United States from southern New England and the Atlantic Coast south to peninsular Florida and west to central Illinois, south-eastern Colorado and the Gulf Coast. The wingspan is 22–38 mm. The larvae feed on the leaves, buds and male catkins of '' Quercus'' species. The species overwinters as an egg.

References

Butterflies described in 1797 Satyrium (butterfly) Taxa named by James Edward Smith Butterflies of North America {{Eumaeini-stub