The Green Warbler alternatively named Green Willow Warbler or Green Leaf Warbler (Phylloscopus nitidus) is a leaf warbler found in the Caucasus Mountains in southcentral Europe.
Like all leaf warblers, it was formerly placed in the "Old World warbler" assemblage, but now belongs to the new leaf-warbler family Phylloscopidae. It is most closely related to the Greenish Warbler but is brighter in color, and the underside is much more yellow. It has one strong and one faint wing bar, especially in young birds.