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) [XC447186]
by Mark Smiles from Al Batinah South Governorate, Oman (call)
Plain Leaf Warbler (Phylloscopus neglectus) [XC695313]
by Oscar Campbell from Nahwa-Al Sadah Picnic Point, Oman (call)
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.