Western Olivaceous Warbler
Iduna opaca
- Least concern
- Card rarity: Common
- Birds

The western olivaceous warbler, also known as the isabelline warbler, is a "warbler", formerly placed in the Old World warblers when these were a paraphyletic wastebin taxon. It is now considered a member of the acrocephaline warblers, Acrocephalidae, in the tree warbler genus Iduna. It was formerly regarded as part of a wider "olivaceous warbler" species, but as a result of modern taxonomic developments, this species is now usually considered distinct from the eastern olivaceous warbler, Iduna pallida.
Classification
- Class
- Aves
- Order
- Passeriformes
- Family
- Acrocephalidae
- Genus
- Iduna