The Garden History Society was an organisation in the United Kingdom established to study the history of gardening and to protect historic gardens. In 2015 it became The Gardens Trust, having merged with the Association of Gardens Trusts. It was founded in 1966, and was a registered charity with headquarters in London. Membership was around 1,500 prior to its merger in 2015. Presidents included Mavis Batey and Sir Roy Strong. The final Chairman was landscape architect Dominic Cole.