Sedge Warbler, Acrocephalus schoenobaenus, is a species of passerine bird in the warbler family found in wetland and river and lake ecosystems. It is broadly distributed across most of Europe, with somewhat patchy distribution across the Central and South-Eastern Europe. During the breeding season this species is found in a variety of low dense vegetation, often near water or in moist depressions, including shore vegetation around freshwater pools, along rivers and canals, and lowland swamps and marshes with reed and bush thickets. It can also breed in dry situations offering suitable cover, such as neglected orchards, hedgerows, nettlebeds, dense scrub, crop fields (European Red List 2015).

Acrocephalus schoenobaenus has a breeding population size of 1670000-2680000 pairs and a breeding range size of 1830000 square kilometres in the EU27. The breeding population trend in the EU27 is Stable in the short term and Stable in the long term.

The EU population status of Acrocephalus schoenobaenus 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).