The mountain swiftlet (Aerodramus hirundinaceus) is a species of swift in the family Apodidae. It is endemic to the island of New Guinea and the nearby islands of Karkar, Yapen and Goodenough. It was once placed in the genus Collocalia but has been moved, with many others, to Aerodramus. The species is divided into three subspecies, with the nominate, A. h. hirundinacea ranging over most of New Guinea, the subspecies A. h.