The Pied Water Tyrant is a small passerine bird in the tyrant flycatcher family. It breeds in tropical South America from Panama and Trinidad south to Bolivia and Argentina. The Pied Water Tyrant is 13.5 cm long and weighs 13g. Adults are mainly white with a black nape, back, wings and tail. Sexes are similar, although the female may have some brown mixed with the black, and immature birds are brown where the adult is black.