The Sunda warbler (Phylloscopus grammiceps) is a species of Old World warbler in the family Phylloscopidae. It is found only in Indonesia.
The Sunda warbler was previously placed in the genus Seicercus. A molecular phylogenetic study published in 2018 found that neither Phylloscopus nor Seicercus were monophyletic.[1] In the subsequent reorganization the two genera were merged into Phylloscopus which has priority under the rules of the International Commission on Zoological Nomenclature.[2]