Afghanistan (B), India, Iran [Islamic Republic of] (B), Oman (NB), Pakistan, Qatar, Russia (Asian), Tajikistan (B), Turkmenistan, United Arab Emirates (NB), Uzbekistan.
Vagrant to Bahrain, Israel, Lebanon, Sweden.
Breeds in mountains of Iran, southern Turkmenia, eastern Uzbekistan, western Tajikistan, northern and south-eastern Afghanistan, and western Pakistan (Baluchistan). Non-breeding coastal Iran, central and southern Pakistan, United Arab Emirates and northern Oman.
 
Population
Estimated population is unknown (2010).
Plain Leaf Warbler (Phylloscopus neglectus) [XC691948]
by David Darrell-Lambert from Wadi near Masafi, Ras al Khaimah, United Arab Emirates (call)
Plain Leaf Warbler (Phylloscopus neglectus) [XC459810]
by Ding Li Yong from Al Mamzar Park, Dubai, United Arab Emirates (song)
Subspecies
No subspecies.
Has been proposed, on basis of vocalizations, that this species is a subspecies of Common Chiffchaff (Phylloscopus collybita), but more widely considered, on grounds of morphology and geographical isolation, as a separate species.