Blyth's Reed-warbler, Acrocephalus dumetorum, is a species of passerine bird in the warbler family found in wetland and woodland and forest ecosystems. It is a widespread summer visitor to central Russia and adjoining areas of northern and central Europe (Bird in Europe 2004). This species has adapted to varied habitats and is not necessarily found close to water; it is more arboreal than most members of the genus. It breeds in a wide range of shrubby growth with tall herbage, young forests, overgrown clearings, birch ( Betula ) and willow ( Salix ) scrub in floodland groves, forest steppes, bush-encroached farmland and swamp and other waterside margins (European Red List 2015).

Acrocephalus dumetorum has a breeding population size of 76500-180000 pairs and a breeding range size of 464000 square kilometres in the EU27. The breeding population trend in the EU27 is Increasing in the short term and Increasing in the long term.

The EU population status of Acrocephalus dumetorum was assessed as Secure, because the species does not meet any of the IUCN Red List criteria for threatened or Near Threatened, or the criteria for Depleted or Declining (the EU27 population or range has not declined by 20% or more since 1980).