Western Bonelli's Warbler (Phylloscopus bonelli), is a "warbler" in the leaf warbler genus Phylloscopus.

The species is migratory, wintering in sub-Saharan Africa. It is a rare vagrant in Northern Europe.

Western Bonelli's Warbler is a small passerine bird, found in forest and woodland. 4-6 eggs are laid in a nest on the ground. Like most warblers, Western Bonelli's is insectivorous.

It is a small warbler. The adult has a plain grey-green back, green-toned rump and wings and whitish underparts. The bill is small and pointed and the legs brown. The sexes are identical, as with most warblers.

The Western Bonelli's Warbler has a browner tinge to the upperparts than Eastern Bonelli's Warbler; the latter sometimes has a greenish tinge instead. The song is a fast monotone trill, only slightly different from Eastern Bonelli's, and also some similarity to Wood Warbler. The call of the Western Bonelli's Warbler is a disyllabic hu-it, differing from that of Eastern which is a completely different hard chup, reminiscent of a Crossbill or a House Sparrow.

This bird is named after the Italian ornithologist Franco Andrea Bonelli.

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