Timothy (Tim) John Entwisle (born 17 June 1960) is an Australian botanist,[2] much of whose research work is in phycology (algae).

[7] He was New South Wales’ Government Botanist in 2007 and 2008,[8][9] and for eight years was the executive director of the Royal Botanic Gardens Sydney (2003–2011).

[13] A major project on taking up the Victorian appointment has been succession planning for the gardens under climate change.

In the same year, Thames &Hudson published his memoir called ‘Evergreen: The Botanical Life of a Plant Punk’[31] about his experiences as director of Royal Botanic Gardens in Sydney, Kew and Melbourne, as well as his life influences and perspectives, particularly about the role of public gardens.

His love of garage music and algae feature in the early years, and there is a chapter on the very public removal of ten fig trees in Sydney during his time as director there.