The Welsh Historic Gardens Trust (WHGT) is a national conservation and heritage charity set up to protect and conserve the historic parks and gardens in Wales. The WHGT campaigns to save historic gardens and parks from neglect, indifference, insensitive planning and inappropriate planting for future generations.

The WHGT aims to raise the profile of parks and garden heritage in Wales which make such a rich and varied contribution to our landscape, promote interest and enjoyment in the beauty and diversity of Welsh parks and gardens including the famous and less well-known, large and small, formal and picturesque, to the widest audience to ensure their survival for future generations and promote the restoration and conservation of threatened parks and gardens, and those at risk of becoming lost gardens, which are of special historic interest in Wales.