The Square-tailed Saw-wing is a small swallow of central and western African forests. It catches flying insects over open places in the forest.
Its plumage is glossy dark brown to black with green or purple iridescence, and its tail is square-ended. Males have a small hooked thickening on the outer vane of the outer primary.
It catches insects in flight over forest openings near water. It nests in a tunnel in a sandy bank and lays two eggs.
An extinction-risk assessment has not been added yet.