Henry's Elfin (Callophrys henrici), sometimes called the Woodland Elfin, is a North American butterfly in the family Lycaenidae. In Canada it is found from southern Manitoba to southern Nova Scotia. It has two main groups of populations in the USA: the first is found along the Atlantic Coast and uses various hollies (Ilex) as host plants; and the second is found mainly in the north and the Appalachians where they use Redbud (Cercis canadensis) as a host plant. Henry's Elfin is increasing in New England because of an introduced buckthorn (Rhamnus cathartica) it now uses as a host plant.