The Square-tailed Saw-wing (Psalidoprocne nitens), also known as the Square-tailed Rough-winged Swallow is a species of bird in the Hirundinidae family. It is found in Angola, Cameroon, Central African Republic, Republic of the Congo, Democratic Republic of the Congo, Ivory Coast, Equatorial Guinea, Gabon, Ghana, Guinea, Liberia, Nigeria, and Sierra Leone.