Australian botanist and botanic garden administrator.
Timothy (Tim) John Entwisle (born 17 June 1960) is an Australian botanist, much of whose research work is in phycology (algae). See for example the articles. He was awarded a Ph.D. from La Trobe University in 1986 for work on the taxonomy of Vaucheria. He was New South Wales’ Government Botanist from 2007 to 2011, and for eight years executive director of Royal Botanic Gardens Sydney (2003–2011). Subsequently, he was director of Conservation, Living Collections and Estates, Kew, London from 2011 to 2013, and from 2013 to 2023 director and chief executive of the Royal Botanic Gardens Victoria