Tachymarptis is a genus of in the family. They are large swifts with relatively broad wings, a large head, a medium-length forked tail and white in the underparts. They are often included in the genus but they are larger than other members of that genus, their nestlings have a different foot structure and they host different species of feather lice. A recent study of mitochondrial and nuclear markers supports the separation of Tachymarptis and Apus. The name Tachymarptis comes from Greek takhus ("fast") and marptis ("seizer").