Vespadelus is a genus of Australian bats in the family Vespertilionidae.
The genus name was first published by Ellis Le Geyt Troughton and Tom Iredale in 1934, but without an adequate description; the type was cited as Scotophilus pumilus Gray, 1841. The 1934 review included taxa previously ascribed to other genera and placed these with the proposed arrangement, the type species was assigned to a new combination as Vespadelus pumilus. Troughton later provided a diagnosis for the genus in 1943, making this name available. Other circumscriptions have assigned these species to genera Pipistrellus and Eptesicus. Reëlevated to genus with new combinations. Also known as forest bats, cave bats, little brown bats.
An earlier treatment of populations had placed them as the sole species of Eptesicus (E. pumilus). The separation to this genus followed comparative studies that recognised its diversity and nominated new species (Kitchener, 1987; Queale.). Subsequent authors recognition of the arrangement published as Vespadelus by Troughton in 1943 saw the name of this genus reëstablished.
The following nine species are currently recognised.