Sumatran mastiff bat
Conservation status
Data Deficient  (IUCN 3.1)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Chiroptera
Family:	Molossidae
Genus:	Mormopterus
Subgenus:	Mormopterus
Species:	M. doriae
Binomial name
Mormopterus doriae K. Andersen, 1907

The Sumatran mastiff bat (Mormopterus doriae) is a species of bat in the family Molossidae, the free-tailed bats. It is only known from Sumatra in Indonesia. It was described in 1907 and has not been recorded since.^[1]

It was described as a new species in 1907 by Danish mammalogist Knud Andersen. Andersen stated that the eponym for the species name "doriae" was Italian naturalist Giacomo Doria, who "always so generously placed his intimate knowledge of Chiroptera and the rich collections of the Museum under his charge at the service of specialists." Andersen had obtained the holotype from Doria's museum in Genoa. The holotype had been initially collected by German entomologist Heinrich Wolfgang Ludwig Dohrn^[2]

Andersen wrote that it was most similar in appearance to Peters's wrinkle-lipped bat, Mormopterus jugularis.^[2]

The holotype was collected in Soekaranda in the Deli Serdang Regency of northwest Sumatra, which is part of Indonesia.^[2] It was collected below 250 m (820 ft) above sea level.^[1]

As of 2016, the IUCN considers it as a data deficient species, meaning that there is not sufficient information available to evaluate threats to this species. Previously, it was considered vulnerable from 1996–2008.^[1] The only individual ever documented was the holotype described by Andersen in 1907.^[2]