Eptesicus is a genus of bats, commonly called house bats or serotine bats, in the family Vespertilionidae. The genus name is likely derived from the Greek words ptetikos ´able to fly´ or petomai ´house flier´, although this is not certain.

Traditional: The following species have traditionally been placed in Eptesicus
2023 proposed revision: A 2023 study noted divisions within Eptesicus when considering physical characteristics, genetics, echolocation characteristics, and divergence timing, with the authors concluding that Eptesicus should be split into three genera. They described a new genus, Neoeptesicus, and elevated the subgenus Cnephaeus to genus rank.

The Old World Eptesicus species were moved to Cnephaeus:

• Cnephaeus anatolicus
• Cnephaeus bottae
• Cnephaeus floweri
• Cnephaeus gobiensis
• Cnephaeus hottentotus
• Cnephaeus isabellinus
• Cnephaeus japonensis
• Cnephaeus kobayashii
• Cnephaeus nilssonii
• Cnephaeus ognevi
• Cnephaeus pachyomus
• Cnephaeus pachyotis
• Cnephaeus platyops
• Cnephaeus serotinus
• Cnephaeus tatei

The Neotropical species were placed in Neoptesicus:

• Neoeptesicus andinus
• Neoeptesicus brasiliensis
• Neoeptesicus chiriquinus
• Neoeptesicus diminutus
• Neoeptesicus furinalis
• Neoeptesicus innoxius
• Neoeptesicus langeri
• Neoeptesicus orinocensis
• Neoeptesicus taddeii
• Neoeptesicus ulapesensis

These revisions left only two species in Eptesicus:

• Eptesicus fuscus
• Eptesicus guadeloupensis