Bobrinski's serotine (Eptesicus bobrinskoi) is a species of vesper bat.

Bobrinski's serotine was described as a new species in 1935 by Alexander Petrovitch Kuzyakin (also spelled Kuzjakin).

[2] The eponym for the species name bobrinskoi was Russian zoologist Nikolay Alekseyevich Bobrinski.

[4] Like all other small-bodied Eptesicus species, it was once placed in the subgenus Amblyotus, whose valid status is now doubted.

Genetic data shows that it is closely related to the Gobi big brown bat, and that Bobrinski's serotine may not be a separate species.