Gwent Wildlife Trust (Welsh: Ymddiriedolaeth Natur Gwent) (GWT) is a wildlife trust covering the area between the lower Wye and Rhymney rivers which forms the vice county of Monmouthshire in south-east Wales.
The Trust's first objective, under the then presidency of FitzRoy Somerset, 4th Baron Raglan, was the conservation of Magor Marsh, the last remaining area of fenland on the Caldicot Level.
It was particularly responsible for survey work, training programmes, and increasingly in educational projects and in campaigns against inappropriate development proposals, particularly those affecting the Severn estuary.
[1] The Trust currently manages over 800 acres (320 ha) of wildlife rich habitat including working farms, woodlands and marshes.
Its projects also involve reviving traditional countryside skills such as charcoal production and dry stone walling.