Gwent Wildlife Trust (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. It is a registered charity and a member of the Wildlife Trusts Partnership.

The Wildlife Trusts, the trading name of the Royal Society of Wildlife Trusts, is an organisation made up of 46 local Wildlife Trusts in the United Kingdom, the Isle of Man and Alderney. The Wildlife Trusts, between them, look after more than 2,300 nature reserves, covering around 98,500 hectares. As of 2020, the Trusts have a combined membership of over 870,000 members.