The American cliff swallow (Petrochelidon pyrrhonota) is a member of the passerine bird family Hirundinidae — the swallows and martins.
It breeds in North America and is migratory, wintering in western South America from Venezuela southwards to northeast Argentina. This species is a very rare vagrant to western Europe.
This bird averages 13 cm (5.1 in) long with a tiny bill. The adult cliff swallow has an iridescent blue back and crown, brown wings and tail, and buff rump. The nape and forehead are white. The underparts are white except for a red face. The tail is square-ended.
Young birds are essentially brown above and whitish below, except for the buff rump and dark face. The only confusion species is the closely related cave swallow, which is richer in colour and has a cinnamon rump and forehead.