Although usually treated as monotypic if the brown-streaked flycatcher is not included, Rasmussen and Anderton, in Birds of South Asia. The Ripley Guide argue that populations in the Indian subcontinent and the Andaman Islands should be regarded as a separate subspecies, poonensis, from the nominate race which occupies most of the species' range. They describe poonensis as paler and browner above, with a deeper bill, and mostly pale lower mandible, a more mottled throat, breast and flanks (in fresh plumage), less contrastingly white "spectacles" and throat, and perhaps a more rounded wing.
Asian brown flycatcher is a common bird found in open woodland and cultivated areas. It nests in a hole in a tree, laying four eggs which are incubated by the female.
The male Asian brown flycatcher sings a simple melodic song during courtship.
This bird is parasitised by the chewing louse Philopterus davuricae.
The Asian brown flycatcher is an extremely rare vagrant to Western Europe. Records have come from Britain, Denmark, and Sweden, and in addition, there are unproven claims from Ireland, Faeroe, and Norway.
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