The Chilean swallow (Tachycineta leucopyga) is a species of bird in the family Hirundinidae.

It breeds in Chile and Patagonia, migrating north as far as Bolivia, Paraguay, and Rio Grande do Sul.

The new genus Tachycineta was created for this group of swallows by German ornithologist Jean Cabanis in 1850.

[2] The current genus name Tachycineta, is from Ancient Greek takhukinetos, "moving quickly", and the specific meyeni commemorates Prussian botanist and collector Franz Meyen.

[5] It is similar to the white-rumped swallow, but lacks the white forehead of that species and has bluer upperparts and grey underwing-coverts.

[5][4] This swallow is native to Argentina, Bolivia, Brazil, Chile, Falkland Islands, Paraguay, and Uruguay.

[1] Its breeding range is from the Atacama Desert in Chile and most of Argentina to the southern tip of South America.