The black-throated green warbler (Setophaga virens) is a small songbird of the New World warbler family. It is 12 cm (4.7 in) long and weighs 9 g (0.32 oz), and has an olive-green crown, a yellow face with olive markings, a thin pointed bill, white wing bars, an olive-green back and pale underparts with black streaks on the flanks. Adult males have a black throat and upper breast; females have a pale throat and black markings on their breast.