Hugh Synge (4 August 1951 - 4 August 2018) was an English botanist of Anglo-Irish descent who was a champion of endangered plants and a key figure in the magazine Plant Talk. He also wrote the Threatened Plants newsletter from Kew Gardens where he was employed. He was influenced by Ronald Melville. He created the threatened plants database which subsequently became the United Nations World Conservation Monitoring Centre. He was also a consultant for the World Health Organization. Later he ran a solar energy firm. His father was Patrick Millington Synge and his mother was .